It is San’s fault that the Nagasumi family are in such a terrible situation now- threatened by her entire mafia family. If she hadn’t saved Michishio, he probably would have died. She is very beautiful and sweet. San is the only daughter of the mafia leader. San is goodhearted and is a humanist. She loves humans and especially her fiancé Nagasumi. She is always jealous of him, but always with a reason. As we know, or we are supposed to know, San is a mermaid. When she has a contact with water, she turns into her sea form. And this is a big problem for her while she is living with the Nagasumi family. San has some extraordinary abilities. She can use her voice as a weapon.