Seto no Hanayome [AniDB]
Devil May Cry [AniDB]A young boy gets saved from drowning by a mermaid but, according to mermaid law, if a human sees a mermaid's true form, both have to be killed. The only solution to the problem is for him to marry her. But can they keep her secret from being found out.
Devil May Cry follows the adventures of the demon hunter Dante who himself is half demon and half human. Dante is hired through his own business named "Devil May Cry". The characters are based off of the popular capcom playstation 2 games.