Seiichi Yukimura's Moon

Xing Ye Yue was a powerful figure in the real world who died in a riot at the age of twenty. She was then reborn in the world of Prince of Tennis, where she became childhood friends with Yukimura Seiichi and a rare tennis player with powerful mental abilities. Cold and aloof, she gives all her affection to Yukimura. As they spend time together, they gradually fall for each other without even realizing it.