Thanks for the chapter!
So it's the entrance of the childhood yandere with a strong sadistic streak. Wonder who her parents are considering she's able to constantly irritate the teachers and cause trouble without being arrested or expelled. Will be interesting to see whether Aika or Toramaru is stronger overall. Although Aika might have an advantage as she seems to think, plan, and such along with being strong while Toramaru seems to rely on brute strength without tactics. Then again Toramaru is smaller and likely quicker so Aika would have to bend over a little to hit her or use a different stance than the one she usually uses against students as tall or taller than her. Be interesting to see how this plays out, and what the other two will do.