Shirou Yusa

A brilliant polymath with mastery over nearly every discipline, this lifelong companion of Ren struggles with a profound sense of boredom caused by his own genius. Driven by an insatiable need for excitement, he once engaged in a violent confrontation with his best friend, leading to a permanent rift in their bond. Following this reckless outburst, he abruptly disappeared from his school life, leaving behind a trail of mystery regarding his current whereabouts.