My Bride is a Mermaid

After a pretty mermaid named Sun who happens to be the daughter of a merman yakuza saves him from drowning, Nagasumi has to make a choice: marry Sun or sleep with the fishes.

Nagasumi has to tell Sun that it's time for him to return home; while he tries to find the right moment, Sun's tiny bodyguard, Maki the Conch, looks for her own perfect moment to assassinate Nagasumi.

Mawari thinks there's something strange about Sun, so she starts investigating. When all signs point to a dangerous situation, Sun might have to reveal her secret in order to protect her friends.

A young merman challenges Nagasumi for Sun's love. Only one will get the mermaid's hand.

Nobody believes Nagasumi when he claims he's being stalked by a huge man with a shotgun.

Luna requests some one-on-one tutoring from Nagasumi, but no amount of studying can prepare him for the consequences when he's caught in a compromising position with his pop idol pupil.