Eren a fallen angel from heaven, is banished to live eternity on earth, no where let to go but the sea, eren shifts in to a mermaid and lives with a met pod most of his life, until he is finally to be crowned king, is when he realizes he wants freedom. After going to the surface for some fresh air, captain levi decides that it's time to capture one I'd the mysterious creatures of the sea, not having enough time to go back under water, een finds himself trapped by the infamous captain , and used only for cruel, inhuman expirements. But what eren doesn't know is that Levi is actually a demon, waiting for a little angel to satisfy his hunger. Will eren start falling for his captor? Or will levi devour him without mercy?