Abe was once an outstanding sales employee, always at the top of the company. But after being accused of abusing power, Abe was sidelined by the company. Previously, Akakura was Abe's subordinate, and Abe had helped him since he joined the company. But now, Akakura has been promoted to department head while Abe has become his subordinate. Akakura also often shows disdain for Abe, which makes Abe even more resentful. Discovering that the beautiful girl at the reception is Akakura's girlfriend, Abe feels extremely unfair and is determined to take revenge! And the way Abe thinks to get his revenge is to... take Akakura's beautiful girlfriend for himself! Abe concocts a story that Akakura has fabricated invoices and that only he can help Akakura hide this issue. But in exchange, Saika will have to give herself to him as repayment! However, Abe later discovers that Saika is a promiscuous woman who enjoys public sex! Taking advantage of this fact, Abe gradually takes possession of Saika's body and mind. And then one day, Akakura discovered everything, but now Saika completely belonged to Abe, who wore a victorious smile as Akakura stood silently watching the woman he loved riding on the man he despised...