It's the season for new encounters. Her son Minoru has found his first girlfriend, but his mother Chizuru is worried. Chizuru has never been satisfied because her husband's penis is small, so she thinks Minoru's penis is also small and he won't be able to satisfy his girlfriend. One day, Chizuru comes into Minoru's room with some juice, unaware that he is masturbating...Minoru's erect penis is out of the ordinary. Since then, Chizuru can't get Minoru's extra thick penis out of her head, so she buys something...