Diane learns of the back-story of Gowther and makes a promise. King faces his final test in the realm and must make a crucial choice that Gloxinia faced 3000 years ago.

Gowther's past memories resurface as he is reminded by the magical heart given to him by his master. Desperate to forget them, Gowther flees and tries to erase his memories, but The Seven Deadly Sins won't make it easy for him to do so.