Kaori, a housewife, lived a quiet life with her husband. Next door, the Fujita family consisted of mother Kyoko raising her two sons, Masato and Kazuaki, alone. One day, Kyoko had to leave home, leaving Kaori to look after the boys. The next day, Masato and Kazuaki visited Kaori's house. They behaved politely, almost as if they were from another world. Kaori recalled Kyoko's past words—how she mentioned the boys were still virgins, only experiencing nocturnal emissions. That memory stirred something new within Kaori's heart.