岸辺 一徳子

The rival team's coach of the mom volleyball club.

She is a landowner who divides the Ichihara family and Yurigaoka territory, having fought with the Ichihara family over land boundaries for over 400 years (?).

She keeps three mom volleyball players known as the “Eroi Triple Stars” under her thumb, wearing nothing but aprons, and plots schemes to “defeat the Ichihara family.”