School Zone Girls manga volume 3 features story and art by Ningiyau.

Hiragi has finally escaped the attentions of her bubbly and boisterous classmate Utsugi…so why is the resulting peace and quiet so dang depressing? And why is Utsugi ignoring her in the first place? Meanwhile, thanks to Yatsude’s “help,” Rei is having bra troubles–and not long after, Kei’s bra suffers from the same mysterious ailment. Is anyone capable of behaving in this series?