Fourth season of High School DxD.
After learning that the group's sophomores will be leaving for a two day school trip to Kyoto, Asia, Koneko, Akeno, and Rias all try to sleep with Issei. During class the next day, Koneko pulls Issei aside and requests that she perform healing sage arts to help him recover the life force that he lost as a result of activating Juggernaut Drive in his fight with Shalba Beelzebub. She even goes as far as to request that they perform “bedroom arts” to further improve his recovery, which requires its participants to have sex with one another, but is interrupted by Rias. Later on, after a dinner hosted at the Gremory family estate, Rias and Issei encounter Sirzechs and Sairaorg, on account of an upcoming rating game between the Bael and Gremory households, Sairaorg requests that he and Issei spar together, to which the latter agrees. In the fight, Sairaorg proves himself to be an immensely powerful opponent, managing to break his armor with his bare hands and delivering extremely powerful attacks. Nevertheless, Issei is able to withstand the attacks and deliver some of his own, earning Sairaorg’s praise. In an attempt to spur Issei on, Asia asks that he touch Rias’ breasts in order to “power up”, which Rias begrudgingly agrees to. Though Issei is more than happy to do so, an amused Sairaorg decides to end their sparring match before he gets the chance, stating that they’ll finish their fight in the rating game, the team then heads home. On the day of their school trip, after having some fun with him on his bed, Rias sends Issei’s group off on the train, and even gives Issei a goodbye kiss, stating that she’ll feel much more lonely than she lets on.
On the train ride to Kyoto, Issei follows Azazel's advice to inject his consciousness into his Sacred Gear so as to unlock a safer strong power than the Juggernaut Drive. After agreeing to lend Xenovia his sword after she was forced to hand her sword over to the church's alchemist, Issei and Kiba make plans for Kyoto in case something comes up. After a few attempts to make contact with the previous Red Dragon hosts, he manages to speak with Elsha and Belzard, the two previous strongest female and male host. They pass him a magical box which contains the potential of the Red Dragon Emperor. Issei manages to open it but the "potential" insides jumps out and disappears. Immediately, Matsuda begins to grope Motohama's chest and says he has an uncontrollable urge to grab chests. The train finally arrives at Kyoto and the group encounters another person who is groping chests uncontrollably, before being held back by some onlookers. At the hotel - which is owned by the Gremory family - Rossweisse and Azazel brief the class before heading to their rooms, in which Issei gets the worst one. Issei's group enjoys sightseeing at the various attractions of Kyoto. However, at one of the shrines, Issei is suddenly ambushed and attacked by a group of Youkai led by a young fox girl, Kunou, who demands the return of her mother, before being supported by Irina, Xenovia and Asia. After the four fight them off, Issei reports their encounter to Azazel and Rossweisse upon returning to the hotel. In the evening, Issei attempts to peep at the girls showering but is stopped by Rossweisse. After a brief struggle, Issei uses dress break on Rossweisse. Back home, Rias, Akeno and Koneko, all missing Issei, have a conversation as to why he prefers Rias' breasts over the others. During a dinner hosted by Serafall, which involves the ORC and student council, she informs that she is there to forge an alliance with the Youkai of Kyoto. However, the leader of the Youkai and Kunou's mother, Yasaka, a ni
After a day of training to prevent being attacked again, Issei and his friends go sightseeing around Kyoto. After sending a picture of Asia and Xenovia in front of a shrine to Rias, Akeno calls Issei telling him that Koneko noticed that the other people in the photo are fox Youkai. Immediately afterward, they are met by the fox Youkai, who bring them to Kunou. After apologizing for the previous unprovoked attack and detailing the investigation conducted by the Youkai to locate Yasaka, Kunou pleads with the group to help locate her mother, which they accept. Still missing Issei, Rias, Akeno and Koneko, begin to wonder how the team are doing in Kyoto. Back at the hotel, Asia visits Issei in his room and they end up hiding in the closet to avoid Matsuda and Motohama. Asia takes the opportunity to kiss Issei after seeing Rias kiss Issei the day they left, but is interrupted by Irina and Xenovia. Upon being teased by Xenovia, Asia passes out from the shock and Xenovia and Irina both enter the closet where Xenovia and Asia (after waking up) try to have sex with Issei, but Rossweisse thwarts them. The next day, the school trip continues with a visit to Arashiyama with Kunou acting as their local guide after volunteering to do so. In the meantime, Azazel and Rossweisse are relaxing at a bar and the latter ends up drunk and depressed after one drink. Issei's group meets up with Kiba after lunch and they go visit the Togetsukyo Bridge together. On the bridge, they are suddenly enveloped in fog and sucked into a parallel dimension. Kunou informs that this is exactly how her mother disappeared. Azazel is suddenly attacked by a beam of light as Cao Cao and his Hero faction announce their appearance.
Cao Cao reveals that the Hero faction, all of whom possess powerful Sacred Gears, kidnapped Yasaka, revealing that she would be the subject of a malicious experiment. He then requests that Issei and his group alongside Azazel engage in a battle against them. After using Dress Break on three Hero Faction members, Issei and his team meet Siegfried, a devil purger and another member of the Hero Faction, who has three arms for each of his legendary swords. While fighting Azazel, Cao Cao reveals his motives: Wanting to determine how far humans can go with respect to other supernatural races. As their battle continues, Issei's team are aided by a mysterious yet cheerful witch named Le Fay Pendragon, a member of Vali’s team and a descendant of Morgan le Fay, who ends up destroying the bridge and a heavily intoxicated Rossweisse, who indiscriminately attacks Cao Cao and his group to no effect before she passes out drunk. The Hero faction flees and begins their preparations for their experiment, which Cao Cao states will take place at Nijō Castle. Some time later, after the Sitri and Gremory households have time to formulate a battle plan. Meanwhile, after fighting off an Old Satan Faction attack, Rias has an uneasy feeling about Issei. Before leaving, Azazel gifts Issei with a mysterious red orb that he found after subduing a molester outside the hotel. Ddraig identifies the orb as the "potential" that Issei received from Elsha and Belzard earlier, but cannot identify exactly what it is or what it will do. On their way to Nijō Castle, Kunou joins their team despite having been ordered to stay behind. A few moments later, Issei and Kunou are pulled into a separate dimension by another member of the Hero faction – one who possesses a Sacred Gear that allows the user to manipulate shadows. Issei dons his Balance Breaker armor, but fails to land any blows against his assailant, who in turn immobilizes him and prepares to deal a killing blow.
As Issei and the Hero Faction member battle, he discovers that he is weak to fire and severely damage him using Dragon's fire. He reveals that his loyalty for Cao Cao stems from him making his life better, despite claiming that he's just using him, he doesn't listen and attempts to attack Issei, who defeats him with a single punch. Finally reuniting with his friends at Nijō Castle, they find Yasaka, but she doesn't seem to recognize Kunou before transforming into an extremely powerful nine-tailed fox, the Hero Faction plan to lure Great Red into the human dimension by combining Kyoto's chi and the Youkai's power and kill it after being branded a nuisance. Xenovia uses her modified Durandal, now named Ex-Durandal, which was fused with Excalibur via Alchemy, to kill the Hero Faction, which obliterates the castle and part of the city, but fails to kill them. Georg starts the experiment, which combines several forms of magic and Yasaka's power to lure Great Red. The Hero Faction then pick what members of the Gremory team they want to fight. Saji, using his Sacred Gear, Vritra, handles Yasaka, while Kunou and Asia take care of eachother on Issei's orders. Meanwhile, Rias shows of her new lingerie she bought to impress Issei when he gets back. Back at the battle, Kiba and Xenovia fight Siegfried who shows off his Balance Breaker: Three extra arms and six swords; Irina fights Jeanne, who's Balance Breaker is a dragon made out of Holy Swords; Rossweisse fights Heracles, who's Balance Breaker fires missiles out of his arms; while Issei and Cao Cao fight without showing off their Balance Breakers. Despite severing Cao Cao's left arm with his sword, Cao Cao uses Phoenix Tears to heal himself. Cao Cao's team arrives, each carrying unconscious members of Issei's team. Heeding Elsha and Azazel's advice telling him to embrace his identity despite his flaws, Issei releases his "potential", which projects holograms of the people of Kyoto the orb managed to possess. The holograms fo
After summoning Rias to Kyoto, he uses Rias as a switch to unleash his full potential and transports her back home. Elsha and Belzard inform Issei that they are leaving for good, but give him some words of encouragement before doing so. Issei uses his new power "Illegal Move Triaina" to attack Cao Cao whom barely manages to defend with his spear. However, Issei's new power is severely draining his stamina and abilities, so he is unable to keep up. Suddenly, Sun Wukong and his dragon Yu Long appear through a gap in the mist. While Yu Long assists Saji with Yasaka, Sun Wukong easily defeats the Hero Faction which forces them to flee. Issei launches one final attack at the retreating Cao Cao and stabs his right eye, permanently blinding it. Cao Cao vows revenge on Issei before fleeing. After exhausting Yasaka, she falls unconscious despite the spell being lifted. With Sun Wukong's help, Issei uses Boobylingual and helps Yasaka regain consciousness. The next day, Yasaka expresses her thanks to Issei's group and bids them farewell at the train station. Kunou also requests that Issei come back to Kyoto soon to visit, which he promises to do. After returning home, Issei apologize for not keeping Rias and the rest updated on the events in Kyoto. Azazel informs him that the school festival is coming up and that Ravel Phoenix would be transferring to Kuoh Academy soon as a first year student, although Koneko is not pleased with this development. Rias also informs that they have to prepare for their rating game with Sairaorg Bael. While training, Seekvaira Agares informs Sairaorg that Issei has gained new powers but instead of being daunted by it, Sairaorg is pleased.
While appearing on an Underworld kid's show depicting Issei saving Rias, Irina asks Issei to zip up her dress, after she volunteered to fill in for the narrator after being injured. Falling in an awkward position after her dress ripped, Irina expresses her desire to have sex with Issei and bear his child before being interrupted by Xenovia, Asia, Akeno and Koneko, who too express their desire to have sex with him until Rias forces them out. While in a hallway, Issei hears one of his fans crying about not being able to meet him, having sold out of tickets for both meeting events. Issei goes to the boy, who introduces himself to him and autographs his cap, but his manager warns him not to do that again as the studio couldn't handle a mass of fans. Rias witnessed his good deed and reminds about how special it was for the fan. Venelana and Millicas then greet the two and tell them about how popular the show is and express concern as to why Issei addresses Rias as "president" and not her name, but Issei says that he will still protect Rias with his life, although neither he nor Rias can explain their personal feelings for eachother due to fear. At school, Rias and Issei encounter Ravel still trying to get accustomed to school life. Noticing her inexperience around the other students, they ask Koneko to be Ravel's friend, which she begrudgingly agrees, although they immediately start insulting eachother. They then try to get Gasper to be her friend but is too afraid to. For the festival, the ORC's job is turning the old school building into a mansion based around the occult. Kiba asks Issei if he's thought about the rating game, where is trying to figure out ways to beat Sairaorg, Kiba then offers to train with him. Azazel arrives and speaks to Ddraig about finding a Councillor, having been depressed since Kyoto because of Issei's perverted nature. Rias and Issei are requested to a medical facility in the Sitri domain by Sairaorg's butler without his knowledge where they
While training for the rating game, Ravel, having overheard his conversation with Kiba, suggests transferring a cannon blast instead of going full on with it, telling them that it's more effective for the team's safety and chances of winning. However, Rias tells them about certain rules approved by the higher ups which may hinder the team's success of winning. The next day, Saji announces that the Sitri house has a rating game the same day as the Gremory house before the ORC head to a televised press conference about the upcoming fight. When the reporters ask Issei questions about his obsession with Rias' breasts, to her embarrassment, he struggles to answer. So Sairaorg suggests that he'll become even stronger if he sucks on them, shocking everyone. After the conference, Sairaorg appreciates Issei's confidence before leaving. Back home in the sauna, Rias flirts with Issei and asks him what she is to him on a personal level. The two share a passionate makeout session and almost have sex until Issei calls her "president" instead of her name, greatly upsetting her. The next day, Gasper claims that Koneko and Ravel have started to bond with eachother, if only slightly and Azazel tells him about how jealousy can bring out the worst in people, especially females. Issei gives Gasper some male advice, boosting his confidence. Azazel reveals that he has been appointed the Gremory house's adviser for the rating game, while Sairaorg has Diehauser Belial, the head of the Belial house and a long-standing rating game champion. Azazel shows them who they're facing while Rias goes over their battle tactics and countermeasures. While still preparing for the festival, Ravel's mother appears as a hologram to check up on the current situation with Ravel adapting to her new school and tells Issei to protect her from the evils of the human world, which he agrees to, stunning Ravel, while also reminding him that she's available. When a shocked Rias walks away, she asks Issei if he'll pro
Concerned about Rias' abnormal behavior as of late, he tries to figure out why. Knowing that she treats him differently than the other males as she actively flirts with him and not them, he concludes that she may be in love with him. Although he tries to deny it due to their current master/servant relationship, being in love with her himself for so many reasons, he wants to start a romantic relationship with her, but his fears about how she'll react and possibly damaging their friendship keep holding him back. Overheard by Akeno, Koneko and Asia, Akeno explains that despite how important Rias is to Issei, if he ever wants to understand her and her needs he'll need to be healed. As such, the girls start "healing" him in a seductive manner and tell him that they never figured out why he was so nervous around them until now: Even after all this time, he never fully got over Raynare's betrayal; permanently damaging his self-confidence and feelings towards women, he was afraid of a repeat of what happened and also confesses that their breasts remind him of her. Asia tells him it's okay because the girls in the Gremory household all love him so much and want to be with him forever, especially Asia, as she can't imagine life without him. She also tells him not to worry about Rias because she doubts that she could ever hate him because of everything that he has done for her so far, which is something that everyone in the family knows. After the girls tell him to believe in himself, Koneko tells him to bury his memories of Raynare, while Akeno claims that the only Fallen Angel he'll need to worry about is her, and move on with his life so that his past doesn't keep burdening him as they want to see him happy and successful. Issei promises to stay together with the group for the rest of their lives, that way he can love each of them forever. After Xenovia and Irina join in and also have fun with Issei with the rest, Issei's feelings towards women is reborn and he feels confid
The fight between Kiba and Furcas begins with them equally trading blow for blow. Kiba then summons his Balance Breaker, which spawns several reinforcements. Kiba defeats Furcas in the first round, earning the Gremory team the victory. Rolling the dice, they are accumulated to ten, where Rossweisse and Koneko are sent out together, facing a knight named Liban Crocell and a rook named Gandoma Balam. Crocell uses his Sacred Gear to increase the gravity around Rossweisse, rendering her unable to move. Despite that, Rossweisse is able to free herself by teleporting Gandoma in her place. Although she releases a powerful attack, Liban survives and traps both girls in his gravitational field. Gandoma, who also survived, emerges from the ground and crushes Koneko. Although she wins, the Gremory house also loses a piece. Issei vows to hold onto his anger for when his time comes. The total comes to eight and Sairaorg publicly chooses his bishop, Coriana Andrealphus, while Issei goes out after Sairaorg reveals he chose Coriana specifically to fight Issei. Coriana attempts to distract Issei by stripping for him, but Issei wins after she tries to take off her panties, which according to Issei, breaks the rules of stripping. The total is once again added to eight, but because Issei cannot be sent out again, Xenovia and Gasper - wanting to avenge Koneko - volunteer to go out, where the face a rook named Ladora Bune and a bishop named Misteeta Sabnock. Sabnock uses a Sacred Gear which nullifies Xenovia powers, in response, Gasper attempts to remove the curse by pouring Issei's blood in a magic circle and goes out to fight to buy her some time. Despite being thrashed around by Ladora, Gasper uses Issei's advice and loyalty to the Gremory household to withstand the attacks, eventually buying enough time for Xenovia to recover and obliterate Sabnock and Bune, although Gasper sacrifices himself in the process. With seven members left on the Gremory team and only three left on Sairaorg'
On the battlefield, Sairaorg takes off his constraints that causes his fighting aura to significantly increase. Taking down Rossweisse with a single punch, although it's later revealed to be a perfectly planned ruse. The Rossweisse that Sairaorg knocked out of the arena was a mimic created by an Excalibur sword which she borrowed from Xenovia and even falling into the water was part of her plan. However, the real Rossweisse is eliminated when Sairaorg fires an attack towards them. Although they sever his right arm, they are defeated when Sairaorg overpowers and eliminates them, while Sairaorg is forced to use the Phoenix Tears to repair his arm. After the total adds to nine, Issei is sent out to fight Kuisha. Issei, angered at the demise of six of his friends and wanting to avenge Akeno, uses his Balance Breaker to eliminate Kuisha instantaneously, which shocks both Asia and Rias, although Azazel discovers that Sairaorg eliminated Kuisha himself, knowing that Issei's attack would've killed her anyway. Sairaorg proposes that they drop the rules and skip to the grand finale so he and his remaining pawn can fight the remaining members of Gremory house, Rias agrees to the conditions and Issei vows to take Sairaorg down as he wouldn't be able to face his friends otherwise. Rias and Issei fight against Sairaorg and his pawn Regulus. Issei and Sairaorg punch eachother, but Issei boosts his ability to inflict more damage onto Sairaorg, while Rias watches as Regulus turns into a golden Nemean lion, one of the thirteen legendary longinuses, whose master was murdered and found by Sairaorg after he destroyed his master's killers. Issei and Sairaorg trade blow for blow, where Issei discovers that his right punches are slower and less damaging then his left one thanks to Kiba and Xenovia severing it, giving him an advantage. Unfortunately for Rias, she has become too weak from blood loss caused by Regulus to have an advantage over him, so Issei pours the Phoenix Tears onto her
Having pulled off a Cardinal Crimson promotion due to the color of his new armor. Remembering his promise to Sirzechs to fight for his and the children's dreams, as well as the dreams of the Gremory family, Issei finally confesses his love for Rias in front of everyone, including her. After that, Sairaorg and the new queen Issei engage in a fistfight duel, although Ddraig reminds him that he hardly has had any time to adjust to his new form, Issei fights through it and manages to overpower Sairaorg. Despite Sairaorg's impressive willpower, Issei uses his Crimson Blaster to severely damage Sairaorg. Although he manages to get up again thanks to his mother's vision, where she explain his vision: A world where skill and hard work is valued instead of what they are. Sairaorg and Issei once again trade blows and although he has newfound respect for Sairaorg, Issei continues to keep fighting to defeat a man like him. Physically drained, Issei loses his armor, but Regulus explains that, though Sairaorg has lost consciousness, he enjoyed the chance to fight Issei even if it meant putting his dream on the line to do it. Realizing what Sairaorg did, Issei embraces him before Sairaorg is eliminated. After winning the rating game, Issei and Sairaorg wake up in a hospital, where they claim it was the best battle they've ever had before Sirzechs arrives to tell them that the higher ups are so satisfied with the results, that the general populace expects great things from them both and tells Issei about a plan to promote Issei to a mid-ranking Devil, along with Kiba and Akeno. Sairaorg then encourages Issei to confess his love for to Rias in private from the bottom of his heart so that she'll know that he's not lying about his feelings, promising that if things go south, he'll be there for him. In the aftermath, the festival takes place and Azazel informs him that although Sairaorg's backers have pulled their support from him, his popularity and power have remained largely the sam