Das ständige Körpertauschen bringt den Alltag der fünf Klubmitglieder komplett durcheinander. Ganz verrückt wird es, als der Verursacher der Tauscherei auftaucht – ebenfalls im Körper einer anderen Person.
The next morning, Himeko, Yoshifumi and Yui all switch bodies together, though soon revert to normal. After the gang make up excuses for their teacher, Mr. Goto, Taichi briefly ends up switching places with Yui before getting grilled by Iori over what happened whilst he was in her body. Just then, the gang is approached by someone who had swapped bodies with Mr. Goto, calling himself Heartseed, who is revealed to be responsible for the body swapping, vaguely explaining the situation before leaving. Following the encounter, the group discuss how best to handle the situation without making anyone else suspicious. A week later, as Iori swaps bodies with Yoshifumi, she talks with Taichi about how the switching may affect their individuality before she switches back. The next day, as Taichi and Himeko switch and end up having to go on class duty with Maiko, Himeko decides to get revenge against Taichi and declare to Maiko that Iori is hers whilst in Taichi's body.
文研部の5人の間で、人格入れ替わりが次々と発生するようになった。
唯と入れ替わった太一は身を隠すために女子トイレに駆け込むが、
やましい目的ではないかと唯から疑われてしまう。
そんな困った事態の連続に、困り果てる5人。
そんなとき、彼らの前に＜ふうせんかずら＞と名乗る存在が現れる。
Los miembros de la Sociedad Cultural Estudiantil tienen un problema y parece estar empeorando. El grupo no sabe que hacer hasta que una misteriosa figura les explica casi todo.
隔天早上，稻葉、青木還有唯身體互換了。不久後，這個現象的始作俑者，自稱風船葛的傢伙，附身在社團指導老師後藤的身上對大家說明了一切…
