Mayu Tsukimura

Mayu Tsukimura is a girl sent by Ryoko to live with Shungo to get over her androphobia.

[Spoiler] She and her brother are succubus, which in this series refers to people with special abilities of attracting members of the opposite sex and feeding on their life force. However, Mayu cannot control her power, which causes her to be chased by the boys very often. [/Spoiler]

(Source: Wikipedia)