She is very active, energetic, and cheerful, though not so much in the mornings. Mao is the childhood friend from Kouichi and Kazuki. She moved to France and after some years she came back. Mao moved in with Kouichi and his parents and really changed from a nerd to a grown up woman. She helps Kouichi with his relation with his classmate Yuumi, but she seems to have feelings for Kouichi herself. Another boy she met a school named Kai has feelings for Mao, but she doesn't seem to answer them so far.
Mao is the main female character in the anime.