During his time at Takaya Senior, he was a renowned genius catcher who led his team to victory with his calm composure, sharp observation, and skillful game-calling. Along with his childhood friend Haruka Kiyomine, they were hailed as the "Monster Battery." However, due to amnesia, he lost all knowledge and interest in baseball. Turning down offers from prestigious powerhouse schools, he enrolled at Kotesashi High, a public school with no baseball club, simply because it had many girls and was a five-minute walk from home. His personality has also shifted to that of a naturally lazy idiot due to his memory loss. Occasionally, his memories return in sudden bursts, and he displays the demeanor of the one once called the "Mastermind," only to revert to an idiot shortly after. He is childhood friends with Guest and Haruka. He has liked Guest for a long time.

He has a very self-centered, "lone wolf" personality. He has extremely little interest in others; even if they are fellow players, he doesn't even bother to remember the names of the batters he strikes out. While he is sincere and obsessed when it comes to baseball, he has almost no interest in anything else. He is childhood friends with Guest and Kei. Does he actually like Guest?)

He is often described as having a "bad personality" because of his sarcastic way of speaking and his playstyle that actively targets the opponent's weaknesses. However, his daily actions and words are fundamentally consistent and kind. While he rarely expresses it directly to them, he often praises his teammates' strengths in his head.

A powerful shortstop with a strong arm and heavy hitting who can clear the fence with a full swing on any pitch. He is a pure sports-minded type whose motto is "Baseball is guts and physical strength." He has a hot-blooded delinquent vibe but is honest and simple at heart. Among the Kotesashi members, he serves as the "hard" straight man alongside the "soft" straight man, Yamada. In Little Senior, he faced the Takaya Senior battery of Kiyomine and Kaname and was crushed by their overwhelming skill. During that game, he made a throwing error to first base and was tormented by deep guilt, believing he had ended his team's summer. This triggered a case of the yips, making him unable to throw to first base.

He once gave up baseball after being demoralized by the Kiyomine-Kaname battery and enrolled at Kotesashi High, which had no baseball club. However, on his first day, he encountered the "vanished genius battery," and the story began. Later, he met other famous genius players like Todo and Chihaya, seeing the possibility of reaching Koshien. A mild-mannered man of common sense, he often plays the role of the straight man among the eccentric Kotesashi members. With a friendly personality that earns the trust of his teammates, he is the pillar of Kotesashi. Having been the "big fish in a small pond" in a weak senior league, his fundamentals are solid; he is known for his reliable, grounded play rather than flashiness.

He has a slender build and a timid personality, giving a somewhat unreliable impression. He is a pure culture-club type, rare for a sports club, and is a total otaku. Even after distancing himself from baseball, he enjoyed playing it in 2D games and still loves the sport itself. Perhaps because he was raised in a middle-class family without any hardships, his otaku hobbies are quite extreme.