Miyuki Ogawa: Good at Sucking 2002 on netflix

Setsuo is a single man in his thirties with no future prospects, no relationships with women, and lives alone. Sometimes, while working overtime, he fantasizes about his coworker Hiromi. But his days change when he starts living with Yaoko. When Yaoko tries to commit suicide on the beach, Setsuo saves her. But just as they get used to living together like a married couple, a man who claims to be Yaoko’s relative arrives…