[Anime]Seto no hanayome

Seto no Hanayome's story revolves around a young teenage boy named Nagasumi Michishio. One day during his summer vacation, Nagasumi was saved from drowning by a mermaid, Sun Seto, in the Seto Inland Sea. However, under mermaid law, if a mermaid's identity as a mermaid has been revealed, either the mermaid who was involved or the human who saw the mermaid are to be killed. In an attempt to save both Nagasumi and Sun's lives, Sun's family, which is apparently the head of its own mob, reluctantly decides that the two are to be married.

Gozaburo, Sun's father, however, is enraged about his daughter running off and getting married, especially to a human whom he deems inferior. Between Gozaburo's attempts on his life and the madcap antics of a whole slew of antagonists — including the daughter of a rival mobster and a rich male transfer student with an attraction for Sun — Nagasumi is not enjoying a very smooth transition into his new lifestyle.
This story has the part which was created by referencing Wikipedia, so the licence of GFDL is applied to this story.

Kimura Tahiko
GANGAN WING SQUARE ENIX
Kisi Seiji
Makoto Uezu
Morita Kazuaki
Takahasi Maho
Itou Sakiko
Yasuharu Takanashi
Satoki Iida
GONZO AIC
Avex entertainment
Haruko Momoi Takahiro Mizushima Sakura Nogawa Kenta Miyake
Makiko Nabei Kuwatani Natsuko Takehito Koyasu
Masashi Yabe Atsushi Imaruoka
Noriko Namiki Eriko Matushima Tessho Genda
Rika Morinaga Noriko Rikimaru Daisuke Ono
Eri Kitamura Vanilla Yamazaki Daisuke Namikawa