@@nellzdablackkingHanako has no problem getting naked in front of you despite being underage. Imagine having to deal with a student who constantly wants to go commando in front of you and has no public shame.
I honestly find it difficult to imagine Koharu as yandere as she was written there, though somehow, I like how controlling you made her sound, Sana. As for Mika, I can imagine her being quite possessive, and then there's how she looks at Gehenna folks.
The only scary thing about a yandere is that they can be allied with the law, something that wouldn't happen unless a certain event unfolded: Paying Child Support
This Is what happens when rhe male character in anime says no I don't want to be your boyfriend . And then if he give a little of excuses then the girl gives insane that they have been friendzone. Cause who dosent love the friendzone?