Yuhi, my girlfriend and the manager of the tennis club, and I are dating. Yuhi is a beautiful, calm, and incredibly innocent girl. Therefore, we have kept our relationship pure; we haven't even held hands, let alone kissed. But why did this happen?! Rewind to the day when the entire club went to a training camp, where we stayed at a hot spring inn. The third-year senior is someone who only knows about sex, and every time he opens his mouth, it’s to mention those raunchy topics. And when I got here, I found out that the club has a tradition where first-year students have to wash the backs of the seniors. When the senior took off his towel, I felt extremely embarrassed to see that his thing was twice the size of mine! After finishing showering, we returned to the resting room. A little while later, while passing by the bathroom, I was surprised to see the senior and Yuhi coming out together. Although the senior said that Yuhi only helped him rub his back, still wearing a towel on his body, I still thought of that image in my mind, an image that I didn't want to happen! And the next day, when the whole club was training, the senior and Yuhi were absent again. After I came back, I also heard that the senior asked another senior to buy birth control pills. It must have been the senior who had done it to his sister at the store, whom the senior had mentioned yesterday. On the last day, with three hours left until check-out, the senior invited us to "play" with the "sister" group, and we could even play naked comfortably because we had prepared birth control pills. Of course I refused and went back to my room. When I went to see how Yuhi was doing, I didn't see her in the room, even the room was like a mess, clothes, crumpled tissues, and the smell of sperm came to my nose! A fear rushed into my mind. I went to the second-year senior's room and found no one. But when I arrived at the room of the third-year senior, the sounds of moans and skin hitting echoed like a blow to my heart. Trembling, I opened the door, and the whole world seemed to collapse in front of my eyes...