tl;dr: A manga that starts off amusing and lighthearted with great comedy and art while not really dealing much with its overarching plot, but does a good job of dealing with it in it's second half, though it's overtly drawn out and overtly serious to the point it's somewhat of a drag.

This is a manga that starts off incredibly amusing. It establishes its setup of what First Love Zombies  are and introduces and characters and the connections between the main trio Kurume, Ibisuki, and Eve really quickly and then moves on to what are essentially episodes of the trio playing matchmaker for the various people in their class in order to stop their love zombies from being major distractions. These stories are pretty solid in and of themselves and produce pretty solid couples, which is in and of itself pretty satisfying. There isn't a lot of drama, at least not serious drama, but what there is is good. What there is more of is a lot of comedy, which is excellent in and of itself and decently varied.

These stories also do a good job of fleshing out the characters more too. Kurume has a really strong personality that's quite a bit different from most protagonists in that he really isn't bothered by a lot of things, wherein throughout the story there are various false traits that other characters assign to him that most protagonists would likely object to and fight against, but he either ignores them completely or he leans into them because they actually help him out. Ibusuki also has really complicated circumstances that involves keeping a lot of secrets, so the resulting strong internal reactions to things that can't show to others at all was amusing and resulted in a pretty likable character. Eve didn't have that strong of a personality, but she's adorable enough to be really likable as well. The pacing also felt pretty fast at first in that there's always something happening that feels like it matters, even if it does just deal with side characters because it feels like there's progress in terms of character development in the main characters as a result. Just all around, it's a pretty light hearted and casual romp that's just kind of fun all around.

Still, from the beginning the premise and mechanics that the author sets up are ones that are kind of screwed up in a sense, and it's clear from the start that unless the author does something like not giving a proper ending or pulling out a deus ex machina that changes things tremendously, that at best the only reasonable ending the manga could have despite it being one that feels so lighthearted at first is one that is at best bittersweet. The author pulls neither of those tricks, and thus eventually the manga begins going down the path of actually tackling its core issues, though once it starts down that path it takes quite a bit longer than I expected to get there. It feels like it's starting to get more serious about half way through, but truly gets completely serious during the last third.

At this point the comedy dries up pretty much completely, instead focusing solely on the drama which gets quite intense. The general tone which was so happy go lucky becomes incredibly dreary. Things certainly progress and things are brought to an ending that seems reasonable, although incredibly predictable. However, it felt like it took too long to get there and the drama was heavily drawn out, though in part that may be because to a degree it felt so out of place considering how different it is from how the manga started. And while the ending is reasonable and did manage to have a good amount of impact emotionally, I can't say I'm completely satisfied with it, only so-so satisfied, though to a degree I expected that I would feel that way about the ending from the beginning.

The art is high quality from the beginning, wherein the premise and tone allow the author a lot of opportunity to really use it well and they certainly do, making the artistic quality for the first half or so downright excellent. However, it felt like that too took a turn for the worse as it got more serious because going completely crazy with the art wouldn't really fit the tone, and thus is becomes much more subdued and in general not as pleasing to look at in and of itself.