Keiji Tanaka serves as the protagonist in the OVA series *Kojin Taxi*. Employed as a taxi driver, he weaponizes his profession to target female passengers. His predatory method involves repeatedly selecting the same women, stalking them to accumulate personal information, and exploiting this knowledge to blackmail them into non-consensual sexual acts. After relocating, he resumes this cycle starting with a fare named Satsuki, an archery club member. He then pursues additional victims including twins, a swimmer, and a cheerleader. Tanaka possesses medium-length brown hair and presents as an adult male.