I and Yuhi - the tennis club manager - are dating. Yuhi is a beautiful, quiet, and extremely innocent girl. That's why we have kept our relationship pure, not even holding hands, let alone kissing. But why did this happen?! Going back to the day the whole club went to a training camp, the accommodation was a hot spring inn. The senior in the third year was someone who only knew about sex, always talking about those obscene things. And when we arrived here, I found out that the club had a tradition, which was that new students would give their seniors a back rub. And when the senior took off his towel, I felt extremely embarrassed when I saw that his penis was twice the size of mine! After bathing, we returned to the resting room. Some time later, as I was passing by the bathroom, I suddenly saw the senior and Yuhi coming out together. Although the senior said Yuhi was just helping him with the back rub, still wearing a towel, in my mind I still thought of that image, an image I didn't want to happen! And the next day, when the whole club was training, the senior and Yuhi were absent. Upon their return, I even heard the senior asking another senior to buy contraceptive pills. Probably the senior had done that with the girl at the store, the one the senior mentioned yesterday. On the last day, three hours before check-out time, the senior invited us to go "play" with that "older sister" together, even suggesting that we could play naked comfortably because the contraceptive pills were already prepared. Of course, I refused and went back to my room. When I went to check on Yuhi, she was not in the room, the room was a mess, clothes, tissue paper scattered around, the smell of semen stinging my nose! Fear engulfed my mind. I went to the room of the second-year senior but found no one. But when I went to the room of the third-year senior, moans and the sound of flesh echoed like hitting my heart. Trembling, I opened the door, and it felt like the whole world was collapsing before my eyes...