Story (4):
This is our average Zombie-type Apocalypse, but instead of zombies we have giants chickens. The plot is very straightfoward, MC must save his brothers and sisters when all the adults became chickens.
This manga have a very weird passing and sometimes the story skip some stuffs.
The ending is rushed in a point MC get healing powers and start to heal deadly wounds. I'm joking a little here, but I guess the mangaka didn't had the time to deal with the ramifications of the characters being wounded so he basically forgot about it.

Art (5):
The characters are draw a little inconsistent. The human characters are draw in three types:
Toddlers - They are draw very chibi and weird. They really look like from a different manga.
Adults - I guess the mangaka wanted to go with "adults are evil", so they are draw very creepy. They remind me the weirds faces that Onizuka from GTO does.
Teenagers - Like the average manga characters.

The background, most of the time, is just a real life photo black and white.

A very important thing to mention about the art is how it got worse with time. In the first chapters everything is very detailed, but the last chapters stuffs looks like a bunch of scribbles.
Apparently this was caused because the gore was making some people uncomfortable. Sadly, this really damaged the art of the manga.

Characters (3):
Most of characters are forgettable and/or useless. They are basically a waste of cast, but let's talk about 3 of them.

Tora: the mangaka, for some reason, really want to paint him as a bad guy. It even a little infuriating because he is apparently the only one capable to do the smart decisions.

Aki: she's the token girl, therefore she's useless. She's just here because I want to mention the scene which she slap Tora because he kill a guy who tried to rape and kill her. Yes, we are dealing with this type of person.

Yuu: He's the Main Character (MC). And he's a Emiya Shirou, in other words he want to save everyone include the guy who tried to rape and kill his sister. To be honest, I hate this type of character in this type of story.

Enjoyment (5):
It was nice in the beginning like any manga, and as the story goes you start to see the flaws. I mostly liked because I like Zombie-type Apocalyptic stories, but it's really not worth it.

Overall (4+5+3+5 = 4.25 = 4):
Very cliche story, bad written with a rushed ending.
Terrible characters and a ok designer.