Tentang
Mikio Shirato is Yukiko's older brother.
Mikio Shirato challenged Joe wearing a set of Ace AI-powered gear that he designed himself in the first season.
Second season
He decided to retire after being defeated by Joe. Since then, he has been teaching at a university as a scientist while continuing his research and development activities.
(Source: Official Site, edited)
Pengisi suara
JepangTatsuhisa Suzuki
Pengisi suara
鈴木達央