Eating the flesh of a mermaid grants eternal life. But living forever can be a blessing or a curse. Immortal lovers Yuta and Mana are relatively lucky... others who partake of the mermaid's flesh are transformed into savage lost souls!

Yuta must confront his past when he and Mana discover the horrifying secret of the Kiryu mansion. Later, when the couple befriends a young boy, they become embroiled in a bizarre child custody fight.