Ichiro Miki is a child living in the industrial district of Kawasaki, where his parents' constant struggle to make ends meet often leaves the schoolboy alone. Constantly teased by a bully nicknamed Gabara, his only friends are toy consultant Shinpei and fellow classmate Sachiko. Ichiro turns to escapist dreams of Monster Island where he befriends the equally bullied Minilla.

Kenji Sahara
as Kenkichi Miki

Machiko Naka
as Tamie Miki

Tomonori Yazaki
as Ichirō Miki

Hideyo Amamoto
as Toy Consultant Shinpei Inami

Sachio Sakai
as Bank Robber Senbayashi

Kazuo Suzuki
as Bank Robber Okuda

Ikio Sawamura
as Bartender

Shigeki Ishida
as Landlord

Yutaka Sada
as Train Engineer

Chōtarō Tōgin
as Assistant Detective