It is time for the Aoi Festival and Kazuki's class, Class B, has done nothing to prepare. Then Yamase, an old childhood friend of Kazuki who is in class F, appears to make him an offer that would solve both their classes problems for the Festival: a joint play performance. During the chaos of the festival, Class B summons a beast that goes out of control, and Kazuki is left to save Yamase from it. His magic count drops to three as a result.
いよいよ文化祭の季節がやって来た！しかし、あと４日しかないにもかかわらず、２年Ｂ組ではまだ何をやるかさえ決まっていなかった。
そんな時、和樹の前に幼馴染の山瀬千早が現れた。Ｆ組の生徒である千早は、和樹にＦ組とＢ組の共同企画でお芝居をやらないかと持ちかけるが・・・。
