The character depth hits different when you finally understand why King and Diane matter beyond the fight. The mystery of Jikkai's history rewrites what you thought you knew about the entire war. The animation collapse is real and distracting, but the emotional payoff for these characters carries you through it anyway.

The Kingdom of Lioness has driven back a demon invasion, but the war is not over. Arthur's Kingdom of Camelot remains occupied by the demon army and the surviving members of Jikkai. Before any counter-offensive can begin, the Seven Deadly Sins need every member at their side, yet King and Diane are still hiding in the Fairy King's Forest. There they are led to learn the strange history of Jikkai. Meanwhile the Sins face trials meant to make them strong enough to defeat the Ten Commandments and to overcome past trauma, with help from figures of the past. As they uncover truths about one another and about those who came before them, they confront a scheme that began ten thousand years ago. The path to liberation grows more complicated as old secrets resurface.