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)
