As peace returns to the Kingdom of Liones, the Sins decide to pursue separate paths to continue their own individual journeys. Gowther brainwashes Guila into falling in love with him, while Diane spends time as a normal human thanks to Merlin’s Minimum Tablets, which allow her to shrink in size. Diane also slowly regains her past memories, which include her prior encounters with King, and reunites with Matrona, her mother figure, and the giant race. Meanwhile, Ban departs for the Fairy King’s Forest with King and the Holy Knight Jericho to continue his duties as he is revealed to be the current Fairy King. Back in Liones, King Bartra’s Vision ability shows him an omen of the impending dangerous Holy War that lies ahead in Camelot.
After the defeat of demonized Hendrickson, The Seven Deadly Sins are commended for their bravery and courage by King Bartra. However, just before the ceremony, Ban and King leave. Earlier, Ban had told Meliodas that he is quitting the Seven Deadly Sins. As Ban leaves the Boar Hat Bar, King sees him and asks where he is going. Ban tells King that he wants to go to the Fairy King Forest. King then accompanies Ban on his journey. Meanwhile, it is reveals that Hendrickson has survived the assault from the Sins and he is shocked upon seeing Dreyfus alive. Dreyfus then summons the Commandments, ten demonized warriors who intend to destroy the Sins.
With Fraudrin's manipulation of Hendrickson, the Ten Commandments return to the physical realm. King follows Ban to the Fairy King's Forest.
Diane confronts Gowther after he manipulates Guila and Zeal's memories. With the return of the Demon Clan, new threats descend upon allied clans.
King struggles to fend off the giant Albion sent to destroy the Fairy King's Forest. Galand of the Ten Commandments appears before Meliodas.
The fairies reconcile their differences with King as Ban leaves the forest. Meanwhile, Meliodas and gang are overwhelmed by the sheer power of Galand.
Hendrickson, thought to have been defeated against Meliodas, aids Gilthunder and the Holy Knights against a powerful Gray Demon.
An injured Diane awakens, having trouble remembering her comrades. With her memories fading, she heads for Megadozer, home of the Giant Clan.
Meliodas and others head to Megadozer in hopes of finding Diane. Meanwhile, a confused Diane encounters Galand of the Ten Commandments once again.
Acknowledging his lack of strength to face the Ten Commandments, Meliodas vigorously trains with the Druids of Istar to regain his sealed powers back.
Ban reflects on his past after returning to his childhood home in Ravens. Meliodas's allies train for their inevitable war with the Ten Commandments.
A frail Zhivago reunites with Ban, is long-lost adopted son. Meanwhile, a wary King confronts Meliodas about his true intentions.
After a brief encounter with Meliodas, the Ten Commandments begin their attack on Britannia. A resurrected Elaine appears before Ban.
A revived but possessed Elaine attacks her lover, Ban, as Melascula and Galand of the Ten Commandments emerge to destroy those in their path.
Jericho carries severely injured Ban and Elaine on her back while escaping from Galand and Melascula before stumbling into a bar deep inside a cave.
Gloxinia and Drole of the Ten Commandments lure strong fighters to Vaizel by offering to grant any wish to the winner of their Great Fight Festival.
An elaborate trap-laded deadly maze constructed by Drole begins to weed out the weaker challengers that have gathered for the Great Fight Festival.
The surviving challengers of the Great Fight Festival are split into pairs and made to face each other in a tag team battle.
King and Diane continue their battle against opponents summoned by Gloxinia and Drole. Escanor refuses to fight against his fellow ally Gowther.
As Escanor's battle with Gowther comes to a dramatic end, Meliodas must now face the remaining Ten Commandments in an all-out battle.
With Meliodas rendered powerless, Ban asks to be transported back so he can aid him in his fight against Estarossa and the other Ten Commandments.
While caring for Meliodas, Elizabeth encounters a former Great Holy Knight thought to have perished long ago by the hands of Dreyfus and Hendrickson.
With Ban and the Holy Knights paralyzed by Estarossa’s powers, Escanor shows up to thwart the fall of Liones at the hands of the Ten Commandments.
As the situation inside Liones Castle becomes even more dire, Merlin, freed from Galand's Commandment of Truth, reappears in her former form.
Determined to kill his former leader for betraying their clan three thousand years ago, Fraudrin takes on a newly resurrected darker, more powerful Meliodas.