Nino is so named because her sweatsuit bears a tag reading "Ni-No-San" (Class 2-3).
Hoshi wears a star mask, and considers himself a superstar. "Hoshi" means "star."
Shiro has an obsession with white lines. "Shiro" means "white".
The creator Hikaru Nakamura is married to Hiroshi Kamiya who voices Kou Ichiyama. They have a daughter together.
Based on a seinen gag manga by Nakamura Hikaru, serialised in Young GanGan.