Chitose, who works at an apparel shop in Tokyo, used the holidays to go home. However, when he was worried about his younger brother, Yota, who didn't show up, and talked to his parents, he said that he didn't go to school because he was a girl. In that case, Chitose tries to cheer up Yota by showing her no bra huge breasts to get the girl interested again, but she awakens the abnormal sexual desire that Yota was sleeping and seeks like a monkey. I was chased by my younger brother and got fucked.