Rena Komine as Izumi Hazuki

Shinsuke Aoki as Mao Kuwashima

Reiko Matsuo as Miki

Masaaki Takarai as Ukiya

Naho Toda as Yo Hazuki

Hideyo Amamoto as Sakai

Masao Kusakari as Dolphin Instructor

Yuji Nakamura as Diving Coach

Kou Machida as Stone Tribe Emissary

Isamu Osuga as Professor Abe

Genjiro Arato as Biology Teacher

Tetsuji Mitoma as Old Fisherman