An incest drama between siblings. Mao lives with her parents and younger brother. One day, my younger brother becomes a shut-in due to bullying at his part-time job. The younger brother, who tends to get stuck at home, begins to look at his older sister Mao with lewd eyes and begins to urge him to have a sexual relationship. My older sister can't refuse because of her complicated feelings. My parents also turned a blind eye to the dark side of the family. Mao is isolated in the family and continues to be creampied by her younger brother.