Hanashinju (1973)

It is early summer and a boyfriend and girlfriend commit suicide in a field of flowers. He survives. The girlfriend has a younger sister whose name is Natsuko who cannot understand why her sister killed herself. She leaves school and her hometown, moves to Tokyo and meets the man to find answers. He works as a scout for a television station by day and at a denim store at night. He has moved on. Natsuko is angry. She meets him one day as he is on his way home to where he and her sister used to live. The two proceed to the apartment, she has no class or morals and they have sex. They move in together.