If you like the horror genre, then you can't miss out on the Highschool of the Dead manga. The horror comes from the fact that the story revolves around some high schoolers who try to survive in a world where the majority of their mates in school get infected with a virus that turns them into zombies.
This is Volume 1, thus you get to learn how everything started. However, buyers need to beware because this story by Daisuke Sato is for more mature audiences, of at least 17 years of age.
You should also know that this comic became very popular in Japan that an animated series was created as well.
You'll know if you'd survive this scenario only by reading the story.