Everyone in here commenting about the same tired lolicon crap when you should be thinking about how SHE KNEW EVERYTHING ABOUT THIS DUDE. Even if shes from the future, she was only 22 and she didn't marry him or anything, how did she get all this info and MEMORIZE IT.
Y'all don't know how intense Yanderes can be but she's clearly an intense one. Learning and memorizing all this stuff in top of devising a plan to go back in time to make sure he marries her!? THATS ALMOST YUNO GASAI LEVEL YANDERE. You all shouldn't be worried about this teacher doing shit, that kid could get to the point where she straight out murks another girl, buries her body and go on like it was a normal day just cuz that girl was maybe a rival.
And if the future travel isn't true, then it makes her scarier! How does a kid get all this info about some random teacher without knowing him personally? Fucking full tilt Yandere. And she said she's trying to basically groom him into being a pedo so he'll fall for her, trying to seduce him and shit.