from ARGONAVIS/Other Characters

Kenzo Hakkoda
Owner of the live cafe Submariner that Argonavis frequents. He was originally a drummer in the band that gave the name of the live cafe.
 * Japanese Name: 八甲田 健三, Hakkōda Kenzō
 * Voice Actor: Atsushi Miyauchi

Shintaro Mashu
GYROAXIA's manager. He had watched an Argonavis performance and suggested that they will be the opening act in GYROAXIA's Hokkaido tour.
 * Japanese Name: 摩周 慎太郎, Mashū Shintaro
 * Voice Actor: Takuya Satō

Gilbert Mont d'or
Brother of Fantome Iris vocalist, FELIX.
 * Japanese Name: ジルベール・モンドール
 * Voice Actor: Tadokoro Hinata