Hakofugu (Black spotted boxfish) lacks confidence and always stays alone by the rocks, watching other fish and feeling envious. Then, one day, upon meeting Himetatsu (Korean seahorse), who has lost the way and is said to be from the sea of Minamata, Boxfish's very first adventure begins. This film is based on the picture book "The Boxfish's Wish" (published by Kodansha), written by Sakana-kun (Fish Guy) — a Japanese marine biologist, TV personality, and illustrator.
戸田恵子
as Hakofugu (Black spotted boxfish)
Amo Yuikawa
as Himetatsu (Korean seahorse)
石田ひかり
as Himetatsu'mother / Bluefin tuna / Japanese sardine
こばたけまさふみ
as Great barracuda /Moray eel / Japanese sardine
岡野友佑
as Marbled rockfish / Japanese sardine
Hajime Sugimoto
as Himetatsu's father
さかなクン
as Whale shark
山口智充
as Asian sheepshead wrasse / Japanese sardine
笑福亭鶴瓶
as Common octopus
