子連れ狼
Koike, along with artist Goseki Kojima, made the manga "Kozure Okami" ("Lone Wolf and Cub"), and Koike also contributed to the scripts for the 1970s film adaptations of the series, which starred famous Japanese actor Tomisaburo Wakayama. In 1992 he himself produced a Lone Wolf and Cub's film which starred Masakazu Tamura. Koike and Kojima became known as the "Golden Duo" because of the success of "Lone Wolf and Cub".