My Bride is a Mermaid

Nagasumi escorts Sun to a festival so they can get better acquainted before their big day; if Sun's dad has his way, Nagasumi won't live long enough to ask for a second date.

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.

To prevent Luna's fans and Sun's followers from murdering each other, Nagasumi offers himself as the grand prize in an all-out singing competition between the two girls.

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.

Luna and Nagasumi's wedding is interrupted by the dramatic entrance of an uninvited guest and instead of bringing a gift to the ceremony, the party crasher is brandishing a blade.

Akeno's job is to snoop around and send mermaids who don't fit in on land back to the sea; it doesn't take much to fail her tests, and now Sun's happiness is at risk.