Okano Yuki, the ace of the baseball team, is in a relationship with the manager, Uesugi Satoru. However, she falls into a trap set by Satoru's younger brother, Tatsuo and they end up having sex.
[Synopsis]
Yuki has had sex with her boyfriend's younger brother and Tatsuo's demands continue to escalate. With a photo of her boyfriend in front of her in her room, Tatsuo forces her to show off the lewd requests he's trained her to make. Just before club practice, she's called to the bathroom, where she's made to relieve herself in a private room, when Satoru and his clubmates come in to relieve themselves. Yuki is impatient but Tatsuo doesn't care and shoves his huge cock inside her! Unable to withstand Tatsuo's assault, she cries out in ecstasy! While on a date with her boyfriend, she receives a call from the next room, disguised in a sexy costume and video calls him. Watched by Satoru, she squirts spectacularly. He then fucks her and her moans echo through the wall. Days like these transform Yuki's body into something lewd. However, Tatsuo suddenly proposes a plan to end his relationship with Yuki. It involves having sex with Satoru in his room. Not wanting to continue betraying Satoru any longer, Yuki accepts his request...