J BOY

Overview

Mikado Hyuma, the ace of the Genkai High School baseball team, was eliminated from the regional qualifying rounds for the final Koshien tournament of his high school career. This man, who is far from being a professional baseball player, happens to play against Kiyohara in an all-star game! However, he is so frustrated that he was completely crushed that he starts practicing hard to defeat Kiyohara. Before he knows it, he has transformed into a pitcher who is attracting attention from the pros.

Source: AniList