Now that was a beautiful kiss. ^_^
The last page brought up a bit more trouble again, though. But I'm sure that's nothing they can't handle together.
Somebody please spell out for me what is so troubling about that last page. (I’m not quite clear what is happening in the “OW!” panel—my first thought is that she got some of Mitsuki’s black polish on her own hand and broke a nail trying to scrape it off. And further, that every little thing reminds her of her gf, distracting her from studying.)
But I could certainly be misreading it.
That looks more like blood to me, and her other nails are in a pretty horrible state as well, so she very much seems to be overworking herself and worrying too much, to the extent of destroying her own nails with nervous scratching.