Twenty-four years ago, Toshio Oki had a stable and good life. He was married and his wife was pregnant. However, the middle-aged-man was having an affair with a sixteen-year-old girl named Otoko Ueno. She was also impregnated, though the child was stillborn. This led to their hidden relationship breaking. Otoko took the death of her child very hard and has to be admitted into a mental hospital. When Toshio Oki’s wife realized what Oki had done, her unborn child also died because of the sorrow the mother felt.
Now, Toshio Oki is a fifty-five-year-old man and wishes to revisit his old mistress. He was an author at that time and had published a book about Otoko named A Girl of Sixteen. There was a painting of Otoko on the book that made him want to see her. Oki travels to Kyoto in hopes of finding her.
When he arrives in Kyoto, Oki realized that Otoko became a lesbian after the breakup with Oki, as she never wanted to feel the pain she did with him ever again. Her apprentice, Keiko, has a relationship with her and they love each other. Otoko is also a very famous painter and is able to put her emotions on paper.
Keiko sees the turbulence in the relationship between Oki and Otoko and is sure there is history between them. When Oki tells Otoko about their past relationship and what happened, Keiko is furious as to what he had done to her. When Keiko sees the emotional hardships Otoko is dealing with, she wishes them away and wants to take revenge on Oki. She sets out to seduce Oki, get pregnant and give the child to Otoko. She also decides to seduce Oki’s son and drowns him while they are on a boat. It is hinted that Keiko also drowns.
