sin: Nanatsu no Taizai

A fallen angel named Lucifer, once a proud archangel who defied God, is sent to the deepest part of hell. During her descent, she encounters a high school girl named Maria, who assists her. In hell, Lucifer meets Leviathan, who informs her about The Seven Deadly Sins—seven demon kings who rule over hell. After her powers are sealed by The Seven Deadly Sins, Lucifer begins a journey with Maria and Leviathan to confront and defeat them.