Hmmm. This had the chance to be a manga with more chapters. It's obvious that the senpai dude would play with their feeling at some point, maybe the big bro of ML (who doesn't have a gf and also looks like a kid) would fall for FL too, even some random girl who has a crush on ML since middle school could start drama... etc. I saw many easy plots who could be introduced, but they didn't, they ended the manga early.
wow this manga makes me feel bitter ughh. I also realized that when someone kissed the main guy, I'll go hysterical but now, I didn't. Maybe because I've already experienced it or I've already matured hehehe