A young teenage boy, Nagasumi, nearly drowns while swimming in the sea, but is saved by a mermaid named Sun. Because her identity is revealed, under mermaid law either the boy or the mermaid must be executed. To save their lives, the Sun family, a powerful mermaid mafia group, decides that the two must be married. However, this arrangement outrages Sun's father who makes several attempts at Nagasumi's life. This is a hilarious manga series for someone who loves slapstick comedy.