The artifact passed down from generation to generation by the Uchiha clan chiefs, wandered into another world after the Fourth World War, but accidentally turned into a human form. It was picked up by the Edogawa couple and they also had an older brother named Edogawa Ranpo.
The Uchiha Uchiha who was named Uchiha Kai was sent to Hyōtei by his brother with a wave of his hand when he was promoted to junior high school. As for why——
"Of course it's because Hyokui's tennis skills are pretty good. By the way, remember to bring back the snacks specially provided by the school!" Said the famous detective brother.
Tuan Fan Jing said: "Brother really considers me the most!"
Everyone in the detective agency: "The second half of the sentence is the real purpose! Blind brother control is not advisable!"
So, a new member came to the Ice King Tennis Club. Because he controlled his instinct to blow things away as a fan, Uchiha returned to the court and hit the ball away, and was successfully targeted by Hyotei Minister Atobe.
"The defense is pretty good. You can actually catch my ball. It's pretty cool. Is it just your eyesight?"
Uchiha Jing said: "It's just the Uchiha's instinct to rebound. My eyesight is the worst."
When he arrived on the court, the shape of a magatama appeared in his black eyes. He could easily see through whatever moves the opponent made, and he relied on his rebounding instinct to fight back. Uchiha Kai became the person that tennis players were least willing to play against.
Opponents: "Liar! Saying that you have poor eyesight is definitely a mist bomb! Don't think that just because you are a beautiful Uchiha, you can do whatever you want!"
Uanfan Jing: Who would have thought that playing tennis can open the Sharingan?
Purpose: To make iron, you need to be tough yourself