Lance, a top class Dragon Caller, and his Tamadra Devi, appear in Vienna City chasing what appears to be a meteorite. The Ace, Rena's son, hears a voice calling him by name several times, and finding an egg with a star shape on it, he brings it home. A monster starts attacking the city, affected by Drop Impact, and Lance tries to stop it using his monsters, while an Devi teaches an agitated Ace about. During the battle, Ace is able to help Lance by drawing water Drops by listening to the egg, when Lance is unable to draw them out himself.
Lance manages to calm down the monster, but the SDF choose the same moment to start attacking it - which enrages the monster again. Lance continues fighting and as Ace is feeling desperate, the egg, almost hatching, encourages his again to get the Drops, using which, the monster is finally dispersed. The egg hatches into a white Tamadra called Tamazo. Later in the day, Ace tries to call Drops, but is unsuccessful. A stranger appears before him and advises to go to the Dragon Museum. He meets a young boy, Charo, a Dragon Caller enthusiast. And he also meets Lance, who has followed Tamazo, to take it with himself. But Tamazo returns to Ace. They meet Garnet, another Dragon Caller, who challenges them to a fight, but ends up retreating after seeing Ace gather Drops, but she later tells Sonia (the stranger from earlier) it was because she didn't want to battle in the middle of the city). Meanwhile Rena converses with someone over the phone, telling them that Ace was carrying an egg similar to the one King had. The person on the other end advises her to send Ace to the Dragoza island. Meanwhile, Tamazo is kidnapped by a group of people.
The kidnappers turn out to he SDF. Ace and Charo try to rescue Tamazo, while Lance wastes most of his time on Govt officials, who just make him go around in circles. Ace and Charo manage to rescue Tamazo following his instructions, and an irritated Lance blasts his way into the base too, only to find the cage empty. Charo convinces Ace to become a Dragon Caller along with him, and they leave for Dragoza island.
Lance refuses to let go of the star fragment, instead calling it a true form of a Dragonoid. Devi manages to reach them, when Ace fights Lance, but blocks Lance's attack by flying in front of Ace.
While Ace and Lance fight, a gigantic Drop Impact occurs at Crocus, but the members of Dominion, now after a change of mind, calling themselves as Dragon Callers, manage to stop it, thus saving the city. Lance and Ace fight even further, and Ana tells Ace that for Lance to return, the Star Fragment must be destroyed completely, but his heart might also be crushed in the process. Ace finally manages to defeat Lance and also crush the star fragment. As Lance falls into the sea, he is rescued by his monsters and Devi, whom he hugs and finally apologizes to. The city of Crocus celebrates its freedom, while a disappointed Jest goes to a dark room, where an unknown character is present.
Torlie is transferred from under the direct supervision of Jest, as he is physically weakened under torture and interrogation. When the news reaches him, the Ancient Vahaton laments being unable to rescue him. However the conversation is overheard by Charo, who decides to rescue Torlie by himself. Come dawn, everyone finds Charo missing along with a carrier dragon. Ace and Tamazo go after him after learning the truth. Meanwhile, Charo is nearly caught by the Dominion, but escapes with help of Ansel, a well known chef, who is also serving food to Torlie to help him recover. Together, they rescue Torlie, and Charo also brings along Klien, who has had a change of heart. Torlie and Klien go to Libria while Charo, Ace and Tamazo return.
Eldora finally awakens, but needs to rest more. So Ace, along with Tiger and Garnet head to Geyser to free it from Dominion's control. On the way, they find a fort, which has a device to amplify the power of they ley lines and with this as a threat, the Dominion have managed to take the whole city hostage. Aget apprears to help them, but the gang are not sure whether to trust him. They decide to follow him, since they don't have any other plans. Aget tells them that he became a 'Super hero of Justice' after being inspired by a comic hero, but decided that his own desires are Justice, after going through a series of failures. During the whole time, he turns out to be quite fickle, switching sides between the Dominion and the Ace & friends, while being totally unaware of what everyone else is saying. Ace and the gang somehow manage to destroy the fort. Once out, they figure out that in the meanwhile, Kroell has figured out the Guild's secret hideout and has gone there to capture Eldora. Ace and the gang hurry there, followed by a completely unwitting Aget. Kroell declines Aget's support while badmouthing him, which enflares Aget, and he defeats Kroell. Ace and the gang turn to the next city to release from Dominion's control.
Kroell makes a contract with Lucifer, gaining his power in exchange for his body and soul. Zelemony's people are fighting the Dominion. Kroell takes Margan with him, to make her into a scrapegoat - he tells the Zelemony's townspeople that she was the one who killed, so that the people believe in Dominion again. Mere figures out that Morgan is accepting the blame in exchange for Jest to not attack the city. The people decide to have Morgan executed for her crimes, but Ace and the gang try to stop them. As they fight against Kroell, he turns out with the upper hand, until Morgan is joined by Harriot, who manage to defeat him. Kroell retreats, inviting them to Jest's place.
As Ace prepares to face Jest, the is joined by everyone else. They all proceed to Exscion, where each member is forced to stop at a level to fight monsters there. Finally only Ace remains, but the one he finds at the top is not Jest, but Kroell. As the fighting continues, Kroell manages to hurt Ace enough, for Jest to come out in his Dragonoid form and try to consume Ace. As everyone watches helpless, Daphness's darkness appears to try to consume Jest. However Kroell tries to help Jest, even at the cost of his own soul being consumed. Just as it seems like Ace will be consumed, Lucifer separates from Kroell, since he wouldn't get Kroell's soul, Jest gets overwhelmed by Daphness's darkness. Ace is saved as Jest and Kroell vanish. All the monster egg drops start returning to their owners.