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Akira Naruse / Gorô Katayama - Private Detective

Taisuke Kurosu, a jeweler

Ayako, Kurosu's second wife

Kiboku Rin - a mysterious manager

Jun'ichi Norita - a young man

Yoshizô - old servant of Akiko

A deaf girl

Akiko Kitamura, a daughter of Kurosu's former wife

Maid of a man in black

Shibayama - Kurosu's secretary

Sagara - Katayama's assistant