Naito is one of the most memorable players from Miuradai High School, appearing during their match against Shohoku in the Kanagawa Prefectural Tournament. Before joining the basketball team, Naito came from a rugby background, a fact that explains his extraordinary physical strength, toughness, and aggressive style of play. His powerful frame and fearless attitude make him a standout presence on the court, but his lack of basketball fundamentals often leads to chaos rather than success.

Coach Harada introduces Naito as Miuradai’s “secret weapon,” hoping his raw power can disrupt Shohoku’s rhythm. Playing alongside teammates such as Hiroshi Takatsu, Akio Kawasaki, Kengo Murasame and Kazuo Araki, he immediately causes problems for Shohoku’s players with his sheer physicality, even challenging Akagi and Sakuragi inside the paint. However, his inexperience quickly becomes evident — he struggles with positioning, commits fouls, and fails to adapt to the pace of the game.

Tatsuya Naito’s clash with Sakuragi becomes a highlight of the match, as their fiery tempers and physical styles collide. Ultimately, despite his strength, Miuradai cannot contain Shohoku’s skill and teamwork. Still, Naito’s character embodies Slam Dunk’s theme of determination — a raw athlete discovering the discipline and technique required to truly play basketball.