It's Yandere albiet like lower yandere not like super hardcore Yandere. I always find these rom coms funny how they treat them like they are a perfect match but he'll possibly get shanked just over having a female co-worker or friend lol.
Oh, so this was one of those fabulous, popular high school transformation debut series.
The dude changed 0 degrees, the girl changed probably 120, assuming she was a good student before and still is, so it's her looks and personality/behavior that changed completely.
Yes because there is absolutely nothing yandere about changing everything about yourself for the one you love love love love love love love love love love