Personalty, this is only one of the two horror zombie-theme manga can get me this emotion, the other one is Undead, but that one invoke another kind of emotions, unlike this one.
Creeper wrote...
Its like High school of the Dead without the underlying feeling of hopelessness and despair
I have to highly disagree with this line, in HSoD, at least the main character has his friend he can trust, can rely on, and some nice boobs to change of pace (that ex-H artist for ya). In this Dawn-Tsumetaite, Nagasawa just there, in the darkness, alone, struggle to fight what might exactly what he will become in the future, with a bastard doctor who see him as nothing but plaything and convenient guinea pig. With no one to turn to, he struggle desperate alone out there, with the only outcome i can come up with just two first volume, is a bullet in the head(dispose of un-usable experimental subject, if you can't figure it out by yourself). With its dark background and not so horror-ist zombie, you won't feel much of horror, but can focus more on the despair, hopeless cover Nagasawa