This is one of my first and favorite BL manga ever. It stars Rintarou, an innocent student who has a crush on his sadistic private tutor. His tutor, Kaede, has zero interest in people. That is until he meets the clumsy, cute Rintarou. I was mesmerized by this manga from the start and I can always come back to get a good laugh from it.
I realize that I described in a way that makes it not as great as it sounds, so don't pay too much attention to my review.