Natsumi had been divorced from her husband for over a decade. Her son Shou always worried about her, seeing she had never remarried. When Shou reached his third year of high school, a man named Kitano began frequently coming and going from their home. Soon after, Natsumi’s behavior started to subtly change, making Shou feel something was off. One day, peering into a room where his mother and Kitano were together, Shou witnessed an unbelievable scene. Kitano’s skillful hands were thrusting into Natsumi’s tight anus, making her moan intensely. Shocked and disturbed, Shou could do nothing but flee the scene. Yet his mother’s expressions and cries were deeply etched into his mind.