Groper Train: Naughty Gaze(1999)

Kazumi has not been able to forget about Akemi, the girl he had a crush on in high school. Kazumi asks Kenji, a detective who was also his rival in love at the time, to investigate Akemi's whereabouts. However, as Kenji investigates Akemi's whereabouts, his feelings for her are rekindled, and he begins dating her. When Kazumi finds out that Kenji has betrayed him...