Reina's husband was on a single assignment overseas, and she lived with her son Shogo. Shogo's friend Shinichi seemed mature for his age and commented to Reina, "As always, Shogo's mom is beautiful." Hearing this, Reina began to be aware of herself as a woman. Meanwhile, Reina, who had started making masturbation a daily routine due to the loneliness of her husband's single assignment, was caught by Shinichi.
