Farewell, My Beloved(1969)

During the early days of the war a young student, Makito (Kazuo Funaki), falls in love with Yuko (Mayumi Ozora), the widow of a naval officer. She, however, is living with the memories of her husband and it is her younger sister, Yumiko (Nana Ozaki), who grows fond of the student. Then, one day, a young naval officer, Tadayuki (Ken Ogata), a friend of her late husband, comes to see the widow and she becomes attracted to him. Though Makito is inspired to study for the navy, he is much upset when he learns that Yuko and Tadayuki are to marry.