Hisayo, a mother who is worried about her son Tsukasa's withdrawal, consults counselor Narumi. Narumi visits her almost every day and gradually opens up Tsukasa's Kokoro. One day, Narumi tells her that one of the reasons for Tsukasa's withdrawal is that he has become aware of Hisayo as a member of the opposite sex. Narumi suggests a method to the distraught Hisayo. When she nods to his advice as if it were a straw, he suddenly asks her to show him her anus...