@LordCukiFlan: I don't pay attention to the self-insert part (mainly because I really. REALLY! Could not care less), but the MC is a pretty decent guy. He's capable (with the cliche dense part), but is driven solely to help the girls improve their studies (and his teacher to literally clean up her act) and that just makes them attracted to him. It really is up in the air who he will pick since he seems attracted to them all, but refuses to act on his feelings out of professional honor and because he has a lot riding on his success.
I have a general rule about manga: The 3 Strikes Rule. These days Chapter 1 doesn't make for a good pull anymore (at least not for me), but if the first 3 chapters doesn't pull me in (at that point a plot will have definitely been established and characters will have enough on them to determine their personalities), then I drop it. A good example of this was "Don't Bully Me, Nagatoro". The first 2 chapters were just sadistic and made me recall my own bad school days. I didn't need a manga that reminded me of the bad years. But Chapter 3 showed a different side of the heroine the, to me, redeemed her and made me curious. I'm glad I stuck it out because it's now one of the best manga I've ever read. But if it had been 3 chapters of pure sadism? Goodbye.
Anyway, that's just an idea, so make of it what you will.