Keito has an overbearing manner, and he enjoys long conversations. Calm and composed, he acts as the vice-president of the Student Council, and he carries out his job with great efficiency. Supporting the student council president, Eichi Tenshouin, as his right hand man, Keito has a strong influence in the academy.

Born and raised in a Buddhist temple, Keito is childhood friends with Eichi, and they often enjoy drinking tea together. He was friends with third year Rei Sakuma before they entered the academy. He's fair-minded and will never find fault with those who follow the rules, but violators will receive a long sermon from him. He has very sharp ears. The leader of the unit AKATSUKI.

At first he appears quiet and almost shy, even having been described as a “quiet glasses guy” by fellow AKATSUKI member Kuro. However, when he has passion towards something, he becomes incredibly determined. Keito is incredibly serious, and takes any jobs he is given very seriously. Even if they make him uncomfortable or confused, he will fulfill a job to the best of his abilities. This is what helps make him a talented leader for both AKATSUKI and the Archery Club.