Leina's husband was on an overseas business trip, leaving her alone with their two sons, Shogo and his friend Shinichi. Shinichi had grown up and noticed how beautiful Leina still looked, saying so out loud when they were together. This made Leina become more aware of herself as a woman. Meanwhile, Leina's loneliness during her husband's absence led her to masturbate daily. One day, Shinichi caught sight of her doing just that. Note: The contents may vary depending on the distribution method used.