As the Protagonist of a Sports Drama, Why Should I Fight?

Kageyama Rin, male, sixteen years old. His cousin is the genius setter Tobio Kageyama, and he grew up as Ryota Kise, a member of the Miracle Generation. He also won three consecutive national championships with Rikkai University. I always thought that I was on the set of a youthful and progressive sports drama. Although he can see monsters, Rin Kageyama, who had yin and yang eyes in his previous life, has not changed much except for making a friend Asashi. However, after coming out of U-17, Rin Kageyama felt that something was wrong with the world. A boy with a sword hanging above his head appeared in Tokyo, five buildings were built in Yokohama, and Vongola's inheritance ceremony could even be watched on TV. After encountering a curse while going out to buy sports tape, Kageyama Rin found that he seemed to have really gone from sports to a high-risk world and might not be able to survive. Rin Kageyama couldn't bear it anymore, so he took out a tennis racket and flew a tennis ball. Second level curse spirit, died. Then Kageyama Rin realized that in this magical and omnipotent two-dimensional world. Maybe, maybe, tennis has become a high-risk weapon. Kageyama Rin, male, sixteen years old. Power: Killing tennis ball. (In fact, it's just a tennis racket and tennis ball available anytime and anywhere) Danger index: five stars Rin Kageyama: To be honest, there are dozens of tennis players like me in the world^_^ *Non-second time travel is the fusion of worlds caused by Qi Shen *Don't follow the plot, the timeline is strange, it's just a daily routine ＊Can OOC, but to what extent is not sure *Tennis is the biggest bug CP says it will happen Intention: Keep up the good work and exercise~