As the demons unleashed by the reawakened Ten Commandments continue to wreak havoc, both the Seven Deadly Sins and Holy Knights realize they're facing a terrible enemy from their past - the demon Fraudrin, who has taken something precious from Meliodas, Griamore, and Hendrickson. After her memories are tampered with by Gowther, Diane must also come face to face with her past before joining the Seven Deadly Sins. How will the appearance of someone she thought she'd lost forever affect the Sins' showdown with the Ten Commandments?