Hiro Shimono (33)

Toshinari Seki (voice)

Kana Hanazawa (24)

Rumi Yokoi (voice)

Miki Ito (51)

Rumi's Mother (voice)

Koji Yusa (45)

Tani-sensei (voice)

Cocoro Kikuchi (31)

Tomoka Hashino (voice)

Tetsuo Sakaguchi (61)

Narration (voice)

Mami Shitara (29)

Yu Nakamura (voice)

Jiro Saito (48)

Adachi-sensei (voice)

Katsuya Shoji

Male Student A (voice), Teacher A (voice)

Satomi Sato (27)

Sakurako Goto (voice)

Tomoaki Ikeda (37)

Science Teacher (voice), PA Announcement (voice)

Minoru Shiraishi (35)

Akiyasu Uzawa (voice)

Shigeyuki Susaki

Takahiro Maeda (voice)

Shin Goto (43)

Japanese Teacher (voice)

Yuka Keicho

Observer (voice), Robot Mother (voice)

Jin Yamanoi (51)

Art Teacher (voice)

Atsushi Kisaichi (41)

Mathematics Teacher (voice)

Shunji Kanemune

Male Student B (voice)

Kanji Obana (51)

Gold General (voice)

Ryo Kuratomi (25)

King (voice)

Kenta Matsumoto (29)

Referee (voice)

Toru Sakurai (26)

Robot Father (voice)

Marie Mizuno

Robot Boy (voice)

Chinatsu Akasaki (26)

Classmate (voice)

Akari Harashima (23)

Student (voice)

Tarusuke Shingaki (37)

PE Teacher (voice)

Isamu Yusen (31)

Male Student B (voice)

Ikkyu Juku (63)

Hobby Shop Owner (voice)

Megumi Nasu (35)

Music Teacher (voice)

Seigo Yokota

Teacher B (voice)