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On a rainy day, the gang discover a hidden note in a book referring to a certain thing, so they decide to search for it. After some investigation they find a key to a locker, but are reluctant to go to the boy's locker room, so Sumika gets Masaki to go for them. The locker contains another note mentioning a German person. With Azusa's help, they make the connection to the pictures of German musicians in the music room. This leads them to the creek (which in German is 'Bach'), eventually finding it to be a prank, but having fun all the while.
Ayahi Takagaki
Sumika Murasame (voice)
Megumi Takamoto
Ushio Kazama (voice)
Chiwa Saito
Miyako Taema (voice)
Emiri Kato
Kiyori Torioi (voice)
Hitomi Harada
Tomoe Hachisuka (voice)
Wataru Hatano
Norio Kazama (voice)
Ai Maeda
Noe Hayasumi (voice)
Ayana Taketatsu
Manaka Akemiya (voice)
Risa Hayamizu
Hikari Sekidera (voice)
Saori Hayami
Chizuka Nishikigi (voice)
Toru Okawa
Tenkai Murasame (voice)
Mayuki Makiguchi
Azusa Aoi (voice)
Hideki Nakanishi
Murasame brothers (voice)
Sakura Koyama
Yoshitake (voice)
Shizuka Hasegawa
Sayaka (voice)
Ayaka Shimizu
Masaki Akemiya (voice)