Pinku from 1968.

Kyoka and her husband, Shogo have just moved into a rented house. Kyoka, who is often away on business due to her schedule, returns to her parents' house because she cannot bear the loneliness and isolation when sleeping alone. The night Kyoka returns to her parents' house, the lights are on even when no one is supposed to be there. There she finds Kanae, a friend of Shogo and Kyoka, who was once in a lesbian relationship with her...