Mako Midori. Mako Midori was 32 in The Japanese Belly Button as 'Helen Amatsu / Momoe / Junko'.
Akihiro Miwa. Akihiro Miwa was 41 in The Japanese Belly Button as 'Business man / Yakuza / Assistant professor'.
Hajime Hana. Hajime Hana was 47 in The Japanese Belly Button as 'Dry cleaning shop owner / Lorry driver / Lighting man'.
Osami Nabe. Osami Nabe was 37 in The Japanese Belly Button as 'Professor / Funayama'.
Gajirō Satō. Gajirō Satō was 32 in The Japanese Belly Button as 'Hattori / Pianist'.
Daigo Kusano. Daigo Kusano was 37 in The Japanese Belly Button as 'Judge / Yaneura / Comedian'.
Noboru Mitani. Noboru Mitani was 44 in The Japanese Belly Button as 'Railway assistant / Takada / Comedian'.
Hōsei Komatsu. Hōsei Komatsu was 50 in The Japanese Belly Button as 'Right wing / Ishii, the strip theatre owner'.
Terumi Azuma. Terumi Azuma was 20 in The Japanese Belly Button as 'Ex-singer / Tome / Stripper'.
Kazuo Kumakura. Kazuo Kumakura was 50 in The Japanese Belly Button as 'Helen's father'.
Michihiro Yamanishi. Michihiro Yamanishi was 29 in The Japanese Belly Button 
Eizō Sugawa. Eizō Sugawa was 46 in The Japanese Belly Button as 'Director'
Yuzuru Aizawa. Yuzuru Aizawa was 52 in The Japanese Belly Button as 'Director of Photography'
Yoshio Shirasaka. Yoshio Shirasaka was 44 in The Japanese Belly Button as 'Screenplay'
Yoshitami Kuroiwa. Yoshitami Kuroiwa was 45 in The Japanese Belly Button as 'Editor'
Ryōichi Hattori. Ryōichi Hattori was 69 in The Japanese Belly Button as 'Music'