A young child is obsessed with learning about and drawing fish. The child seems a little odd, but if you are understanding and supportive you will be cheering in the end.

Concert for Tokyo Ska Paradise's 35th anniversary held at Koshien.

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.