Yuka, who lives with her son, is introverted but enjoys a happy life with her kind son. One day, her son brings over his friend, Yano. Unlike her son, Yano has a slightly flirtatious vibe, making Yuka question if they’re truly close. However, she finds Yano surprisingly approachable. After sharing dinner, Yuka feels a strange warmth and can’t resist masturbating. Yano catches her in the act…