I want to recommend this manga, to those who haven't read it yet I advise you to read it! This manga is really funny ^0^, and don't let the cover fool you o_0.
The summary is: The story is of Kitano Seiichirou, a very kind and pure-hearted young man, with a horrifying, monstrous face. People being what they are, they think he's a terrifying delinquent, and there are plenty of chance misunderstandings (coupled with Kitano's convenient inability to understand what's happening around him) that propel him into the position of "school guardian", a.k.a. head thug on campus. (from Onemanga)
I promise you'll hurt your stomach when you read this.