Sex Rider: Wet Highway (1971)

With her wedding only one day away, Mina spends a night with her former lover Ozaki at a highway motel on the outskirts of Yokohama. On her way back from her last adventure, Mina's car hits a hippie-like youth called Ryo. Shocked by the accident and left alone by Ozaki, who hated to be involved in the trouble, Mina places the unconscious youth in the back seat and drives toward a lake.