Common-Sense Monster, Vol. 2 - Warugi Wanai

Itou is learning how to be normal from her classmate Takahashi, who--despite being a monster in disguise--is a social butterfly. But suddenly, the very teacher Takahashi killed returns as a monster. This new Niehara-sensei aims to eradicate most of humanity and create a bizarre new society. Determined to protect everyone's sense of normality, Itou takes a stand...