Pg 2 : more like a hellish heaven.
Last page : forget it, it's definitely hell, the deepest part.
If you have any doubts allow me to tell you with my diploma-less ass, she's a yandere. Just the non-stabby type.
Imagine introducing the childhood friend, who usually never stands a chance, after the MC has gotten a girlfriend. And said childhood friend is trying to turn the manga to NTR. I already hate her.
Koharu, you gotta be more assertive.
She's definitely yandere. Can't say she has a real mental illness but she's definitely mentally abnormal. So yeah, a bit of yan- and way too much -dere.
Also R.I.P new girl.