During his summer break, middle schooler Nagasumi Michishio visits the Seto Inland Sea. One day, while swimming at Mio Sun Beach, his leg suddenly cramps. No one is near enough to hear his desperate cries for help, and he sinks into the ocean, left to drown alone. Just as he loses consciousness, however, a mermaid appears and saves his life. That night, Nagasumi is visited by his savior, a girl who introduces herself as Sun Seto—a mermaid from a yakuza family. As it turns out, under mermaid law, a mermaid whose identity is revealed to a human must be executed. To avoid this harrowing outcome, the Seto family propose a solution: Nagasumi must marry Sun or be killed by Gouzaburou, Sun's father and boss of the Seto clan. Faced with no other option, Nagasumi agrees to marry her. Now, the newlyweds face the difficult task of keeping their relationship secret. Between Gouzaburou's unending attempts on Nagasumi's life and the eccentric antics of a slew of antagonists, a genuine and innocent love blossoms between the pair as they adapt to their new life.