AWWWW, it looks like they both are realizing they like each other...now let's see if they can start a relationship before we hit fifty chapters or something stupid.
Now, I wouldn't know a thing about menstrual pain, but it's been bigged up as such a horrifying demon that I don't think it could possibly be understated (though definitely infrequently mentioned in fiction). I'm just going to assume that it can actually get bad enough that it causes women to pass out. In which case...oof.
i dont get the fact that he seems to like her, shes just an annoying psycho. from our perspective we can see some of what shes thinking so she doesn't seem as bad, but from his perspective shes just a lunatic trying to ruin his life. theres no reason he should like her other than her appearance
Honestly, seeing her passing out on the stairwell and about to fall backwards was pretty frightening, a very real and dramatic sort of fear. Props to this mangaka.
@botodopo remember he apparently has no friends, she is basically the ONLY one of his peers (at least that we know of at this point) who willingly interacts with him in any form. For someone so heavily isolated thats a big deal