It's a bright, sunny day and Kouichi wakes up from a dream only to have a cute girl, he is doesn't seem to remember, intrude into his home. It is only until when his friend Kazuki arrives that he is able to remember that the girl is Mao who moved to France 2 years ago. But they didn't get much of a chance to catch up, because Kouichi and Kazuki are being forced to do something for the Movie Club. The next day is the opening ceremony for the Kibina high school and Mao will be transferring there.
春休み。高校２年への進学を控えた光一は、気になる女の子がいるものの誘う勇気もなく、家でひとりくつろいでいた。そこに突然来訪する美少女。我が者顔で家に上がりシャワーを浴び始めた彼女は、何と2年ぶりにフランスから帰ってきた幼馴染みの摩央姉ちゃんこと水澤摩央だという。ビン底眼鏡で受験の鬼だった摩央しか知らない光一は、その変貌ぶりに唖然とする。
