Tamaki, Yusuke's sister, has always been bold and provocative. When Kazuya visits Yusuke's house for the first time in a while, he accidentally walks in on Yusuke and his sister finishing up a sexual encounter in the bedroom. Stunned and confused, Kazuya stands frozen in place. Tamaki, aware that Kazuya saw everything, deliberately begins masturbating in the room while knowing he's watching. Overcome with restless desire, Kazuya retreats to the bathtub, only for Tamaki to suddenly appear before him—pushing his emotions to the breaking point!