Ryouhei Yamanouchi  

, 山之内 遼平

The individual possesses a friendly demeanor reminiscent of a dog and exhibits a bright and open personality. In elementary school, they were friends with Minato and Seiya but attended a different middle school. Upon meeting Nanao, they quickly formed a bond and became close friends. Although initially intimidated by Kaitos intense expression, when alone they address him as "Kaito-kun" with sincerity. This individual has the ability to perceive others emotions and acts selflessly with genuine concern for their wellbeing.