Story:
The story was so bad, it hurted tbh.
Episode 1 was really generic and lazy writing everywhere, like literally telling the viewer, that there's a virus, that instantly (for some reason) kills ppl under 14 (or 13, I forgot) . It's so lazily done, as if we couldn't get it by ourself that something is killing everything but kids, since it's basically everything the virus is. It's never described further what the virus is. Also it's really weird that they all died instantly and for some reason they can't kill anyone under 13 becuz anime logic, I guess.
Also the tone is all over the place from happy go lucky to "I must kill all the vampires" and the pacing is bad as well.
Everything is generic and have been done elsewhere better. A lot better.
The storytelling is, like I mentioned, poor written and had everything spelled out to the viewer. It was just like the anime insulted my intelligent, since it had to say things like "it's a memory" out loud, as if the viewer would in no way get it himself.
It's mainly about the humans vs vampire with Yuu and his harem in focus. The pacing is akwardly slow and the intense scenes were utterly boring, I lost my attention in mere seconds. It's not like we all don't know what'll happens, since it's really, really predictable.
Somehow does everything the story just "happens", becuz of "convenient reasons". The world is shallow and why the heck is there a school in the middle of a warfield. Everything feels so forced, due of it's lazy writing, which includes exposition and dialog. And also many things didn't make sense, yeah.
Characters
A story can be shitty as hell, but when the characters are good, an anime can still be enjoyable
Guess what
I hated almost everyone.
Especially Yuu, the protaganist aka the generic shounen hothead MC.
Was he made to be so annoying, since I hated the hell out of him. Everytime he opened his mouth to say "i need to kill the vampires" or "I need to protect my harem/friends" I want to punch him into his face.
btw, his mood is really weird, since it switched constantly from revenge to protecting his friends. The mood change feels so forced, it's like he's a robot with only these two options given.
Also, why is he constantly disobeying almost everytime?
The rest of the cast are mainly built of walking cliché, so I don't bother with them.
Art:
The art was ok,
the background looked pretty, but boy, the animation quality dropped so hard, in the end there were almost no movement in the "action" scenes, yeah... "action".
Otherwise it was ok or more like watchable. My only problem with the artstyle the series goes is that it looks so out of place, meaning that the art and the animation don't synch with each other. Doesn't look like they belong to each other.
Inside a building it was barely noticeable, but in the outside the difference could be spotted easily.
Anyway it's still decent enough.
Sound
The opening was quite enjoyable, even tho I didn't like it a lot. Reasons would maybe be the intro, since it's a bit weird. But the refrain is quite good and I like hearing to over and over.
The rest of the OST did their job, but nothing really stand out, so that when I'm hearing it, I'd think of OnS
But not bad.
Enjoyment
Like someone might have guessed, I really can't stand the anime.
So many thigns were cringeworthy and I don't have anything I like there.
I didn't even wanted to watch the anime, but since a good friend of mine, who shares smiliar interest, I even bother watching.
In the end, when I lost my hope of the anime eventually becoming good and started laughing at the bad scenes.
It was still a waste of time.
Overall:
If you like to watch generic ppl in a generic plot with generic villains, fine go watch it.
Second season is incoming and I don't see any sign of it becoming better.
