The manga is an absolute mess. Barely anything has been revealed, everything is still being kept in the dark while so many things are happening. Sound waves emitted by bugs that turn only women into pseudo zombies? The biggest bullshit kind of logic ever. I get that it's manga, but cmon. You can do better than that.
Not to mention, the pacing of this manga is all kinds of fucked up. And while the deaths are supposed to be somewhat sad, due to the lack of character development for any of them, it doesn't leave much impact. The mangaka also completely time skipped the beginning of everything, and just kinda tossed the reader into the midst of it all without any proper background, build up, or knowledge. The professional level of story telling in this manga is akin to a child trying to explain a story.
This could have been something promising, but sadly there just seems to be a lack of skill as a story writer on the mangaka's part.