I recommend you to read " The King of the Nets: The Emperor of the Court ". This novel was written by the author Boccaccio. It is a light novel-derivative doujinshi novel. The story revolved around the brother of the protagonist, Sanada Genichiro, who had transmigrated to the world of the Prince of Tennis. He was the king of the tennis courts in the world of the Prince of Tennis. If you like the Prince of tennis, this book will not disappoint you. I hope you like my recommendation.😗