is a Japanese manga series written and illustrated by Yuna Kagesaki. The series was published in Japan by Fujimi Shobo and serialized in Monthly Dragon Age magazine. The manga has been distributed in English by Tokyopop. The story is about an immortal girl, Seine Miyazaki, and an orphan boy, Tatsuya Tsugawa, who gets involved with her. Plot After both his parents died in an accident, Tsugawa Tatsuya is now left with millions in inheritance that he cannot use. In the weeks after, he is still mourning and thinking about his father's last words, "A Tsugawa family's man must be a man of great caliber". However, Tatsuya is not confident he can fulfill his father's last wish. One day a week after the accident, he meets Seine Miyazaki, a strange girl who seems to enjoy being bullied. Tatsuya believes he can help her although his friends only see her as a masochist pervert, and Seine herself told him to mind his own business. Seine hunts creatures of the sea, a kind of parasitic bug that controls humans and influences them to do hateful things. She possesses an immortal body and a beast called AiON that is used to lure and devour the bugs from inside the human host. She and the bugs naturally have an impulse to kill each other on contact. Even so, Tatsuya still cannot just leave her alone. He wants to help her. Characters Main Characters (Drama CD) Miyazaki Seine is a 300-year-old girl with an immortal body who Tatsuya invites to live in his home; before that she lived in a cardboard box in a park. In the first episode, Seine looks like a masochist because she seems to like being bullied. Actually, she becomes close to people who are infected by "mushis", a kind of parasitic, mind-controlling bugs, in order to hunt them. Her hunting ways go against the kind and pacifist Tatsuya's beliefs. Her motive is to avenge her foster father Shimon's death by killing the people of sea, the mermaids. She controls a black snake called Aion that lives inside her. Her weakness is her inability to swim. Tatsuya at first calls her "Miyazaki-san." She tells Tatsuya to call her "Seine" since "Miyazaki" is just made up; "Seine" merely sounds most like her real name. She claims to only love Shimon, but she is slowly warming up to Tatsuya. (Drama CD) After the death