"I used to have sex three times a week as a matter of course, but recently the frequency has decreased. It started around the time I met you..." Atsushi reunites with his college friend, Yuuji. Yuuji, who got married a few years ago, boasts about his beautiful wife, Ririko, who loves sex and says their marital relations are going well. Overwhelmed by his own excessive libido and feeling envious, Atsushi harbors a certain desire and secretly visits Ririko, eventually overpowering her. Unable to control his insatiable libido, Atsushi continues, and although Ririko resists, she reaches climax. Furthermore, being continuously creampied by Atsushi five days a week, Ririko eventually finds her husband inadequate...