The 45m Grade-Schooler

Toshiya Fiji

Gaku Hoshikawa

Kei Shindachiya

Ken Hoshikawa

Ryohei Kobayashi

Fumiya Hoshikawa

Kazuko Miyata

Kazumi Hoshikawa

Ryo Narushima

Remi Hoshikawa

Motoko Watanabe

Zaza

Rica Matsumoto

Arthur G6 (voice)

Takeshi Ishikawa

Captain Garoa

Osamu Kato

Dongoros (voice)

Hatsue Nishi

Doldora

Chika Matsui

Medou

Shunsaku Kudo

Billion

Eiichi Onoda

Narrator

Chika Sakamoto

Sairagin (voice)

Isao Kamata

Father

Rumi Watanabe

Mother

Shinji Uemura

Boy