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 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.

Sun and Nagasumi leave Maki behind and venture out to take in the sights and sounds of the city; when Nagasumi has to confront a couple of bullies, they may wish the tiny terror was still around.

Newly enrolled Sun makes quite a splash among her classmates on the first day of school, but Nagasumi is more concerned with some of the new teachers, Sun's dad and his goons.

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.

When Nagasumi discovers the secret mermaid identity of a famous pop star named Luna, the little diva demands he become her personal slave; her plans for childhood rival Sun are even more drastic.