Yotsu already has fun ways to deal with Ui's mother, self esteem and bullying.
Compared to that killing someone is easy; she can poison Yae. If she does that before revealing why Uichi was bullied then there's no motive.
Cool chapter. This time her outfit was more cosplay than clothes, eh?
Tearmoon is only getting an anime now?
I had memories of seeing it, but it seems I just imagined it too well when reading the manga...