The story begins like a normal school teen, with 2 guys who are friends and rivals. Then, out of nowhere, a monster starts to kill everybody and the guys run for their lives.
The manga is good and catching; however, it was not WOW as the lady who sells the manga to me told me. Maybe because it is somewhat similar to Gantz... anyone can die without notice. The art is good though; no fanservice, nice facial expressions, and it is pretty dark.