Kouichi always thought of Mao as his little sister, but when she returns after living in France for several years, she's definitely not his little sister anymore! Which makes the fact that Koichi's mom has invited Mao to stay at their house while she attends the same high school a path fraught with peril. Especially since Kouichi's been trying to build a relationship with Yuumi, and the revelation that the cute new house guest is a non-related girl may become a full blown disaster by the time his best friend Kazuki, her sister Nana, her best friend Narumi, Asuka, Eriko, Mitsuki, Megumi, Eiji and all the other kids at school get overly involved.

Contains episodes 1-25.

Special Features: Clean Opening Animation, Clean Closing Animation.

Spoken Languages: Japanese, English subtitles.