is Kengo's father who worked for the OSTO at their lunar base, which would later become the Rabbit Hatch. While studying Cosmic Energy with Mitsuaki Gamou and Kuniteru Emoto, Utahoshi reverse-engineered the Fourze System from the Core Switch in the hopes that the finalized versions would be made for future generations after his death. Seventeen years before the series, Gamou tasked Emoto with getting the Zodiarts Switches from the OSTO lunar base to Earth. In the process, the latter abandoned Rokuro on the moon. Before he died, Rokuro left an inscription explaining the legacy he meant to leave behind with the Fourze System.
