Kiyono reveals she is going to be a model for her mother's underwear collection, but has a problem with her current breast size. Nayu and the others try to help make them bigger, but to no avail. She tries doing the shoot wearing a slightly bigger bra, but it's soon noticed and when her mother confronts her about it, she runs off. Spotting some more comfortable bra prototypes, Nayu decides to decorate them to fit Kiyono's likes better. Kiyono's mother gives them their thanks, and also mentions Keigo's offer to Nayu. After being featured in the magazine as the designers, the Underwear Society are approached by the drama club to produce underwear for their costumes for the cultural festival. When Nayu asks Keigo about his offer, he tells her that he is going to Kyoto.
Minori Chihara
Nayu Hayama
Sayuri Yahagi
Haruka Shiraishi
Minako Kotobuki
Yako Jingūji
Takahiro Sakurai
Keigo Hayama
Yoko Hikasa
Kiyono Amahara
Yuudai Sato
Hiroki Komachi
Sayaka Ohara
Tamaki Mizuno
Ako Mayama
Tsukamoto-sensei
Gara Takashima
Yōko Sagisawa
Tanuki Sugino
Principal
Katsuhisa Houki
Ōkuma-sensei
Motoki Takagi
Kōta
Naoko Sugiura
Kaori Seto
Takashi Onozuka
Komachi's older brother
Toshiyuki Morikawa
Tsuzuki
Umeka Shouji
Chigusa
Yuichi Nakamura
Tanihara-sensei
Yuiko Tatsumi
Suzuki
