"Until now, sex three times a week was the norm, but recently it's been happening less and less. Ever since I met you..." Atsushi reunites with his friend from college, Yuji. Yuji's wife, Rinko, whom he married a few years ago, is not only beautiful, but also loves sex and boasts that their marriage is going well. Atsushi, who has an incredible sexual stamina that he can't control, has a desire and secretly visits Rinko and forces himself on her. Rinko resists Atsushi's uncontrollable sexual stamina, but she climaxes, and after Atsushi continues to cum inside her five days a week, she finally becomes dissatisfied with her husband...