Common-Sense Monster, Vol. 3

Without warning, Nie-sen has murdered Hiraizumi and replaced her. Yet no one seems to notice that the new "Hiraizumi" is an imposter. Itou finds herself torn between wanting to preserve everyone's blissful ignorance and being unable to forgive the monster for what they've done. So she decides to kill Nie-sen...but if she does, will she have to kill her beloved Takahashi too?