Professor Sakai / Mr. Sakai

Morita Tokunosuke

Banno Magosaku

Mitsui Sanpei

Banno Keiko

Mitsui Fujiko

Horiuchi Senko

Yamamura Yumi (Senko's little sister)

Mr. Yamamura (Yumi's father/Keiko's uncle)

Mitsui Ichiro (Sanpei's nephew)

Miyamoto Mary (Doctor)

Banno Midori

Student A

Female Student A

Narrator

Cameo