Yuzuru, who entered a prestigious boarding school famous for table tennis and lived a life of club activities where he was not immune to women, came back to his parents' house after a long absence.On the other hand, Yuzuru's sister, Ai, also returns to her parents' house after a marital quarrel.Ai, who was stressed out during the conversation, learned that Yuzuru was still a virgin and seduced him as a joke, but he took it seriously. Mushaburitsuku ... I ended up vaginal cum shot ....