When I first showed my friends what I was reading, they thought I was reading porn! Then when I corrected them, they altered their minds and thought of it as a comic. Luckily I have corrected them again on this matter, and they are now all ardent fans as well as me.
Now that I've got any misconceptions about this book out of your head, let me actually talk about it. It's authentic Japenese manga, which means you read from right to left, unlike with western books. It was my first time reading an authentic manga and was a bit off putting at first, but about half way into it, I was fine, and didn't even realise I was reading it 'eastern style'. There is also a handy hint page at the back (although at first glance it seems to be the front) which helps you with this problem.
The actual graphics are excellent and the landscape is so detailed considering how small the captions actually are. Also you have odd bits of Kanji script dotted here and there when one character is particularly excited that added to the authenticity of it.
On to the actual story. Wow. It's hirlarious. It's about a boy/man called Keitaro Urashima who is 19 years old, a 2nd year ronin (student who didn't pass the exams to get into their chosen university) and basically a pathetic loser. When his parents chuck him out he goes to live in his grandma's old hotel... only it's now a girls dormitory. He becomes landlord and the girls all torture him but eventually come to accept him. The sideline plot is that Keitaro is trying to getting into Tokyo University because he made a promise to a girl when he was 5 that he would. He thinks the girl is Naru Narusewaga, one of the girls from the dorm who is a hot-headed yet studious girl.
Overall, it's an excellent book, and the series (well, what I've read so far) is brilliant as well. I would definatly reccommend you buy it as it has brightned up my day many a time.