Reo is the heir of the Mikage Corporation, with his total assets valued at about 705.8 billion yen or $5.3 billion USD. Prior to entering Blue Lock, he was a student at an elite high school, where he met his first long-term friend, Seishiro Nagi, who started playing soccer shortly after him due to Nagi's natural talent in the sport, and Reo's craving to go further in football.