Gen Hoshino as Senpai (voice)

Kana Hanazawa as The Girl with Black Hair (voice)

Ami Koshimizu as Naoko (voice)

Aoi Yuki as Princess Daruma (voice)

Hiroshi Kamiya as Director of School Festival Operations (voice)

Chikara Honda as Bookstore Shopkeeper Gabi (voice)

Hiroyuki Yoshino as God of the Old Books Market (voice)

Junichi Suwabe as Nise-Jōgasaki (voice)

Kazuhiro Yamaji as Todo (voice)

Kazuya Nakai as Seitarō Higuchi (voice)

Mugihito as Ri Haku (voice)

Nobuyuki Hiyama as Johnny (voice)

Ryuji Akiyama as Don Underwear (voice)

Seiko Niizuma as Kiko (voice)

Sōichi Nakaoka as Kōsaka (voice)

Yuhko Kaida as Hanuki (voice)

Daisuke Harada as Keifuku Electric Railway Study Group Student (voice)

Takahiro Shimada as Sophistry Member (voice)