This manga is quite unique. I've never expected to find someting so good from looking at random manga to kill some time. But anyway, let's get to the review.

Story: The story is really well made. l It's about a methot called 'Tsubomi Methot' that is enforced to kill the second generation children (or so called W Children). But why do we need to kill the second generation? Because they have powers that most of the time are destructive, they can ruin the normal lifes of the people that are not second generation or destroy them completely. The story follows our protagonist Wakaba, that is also from the W Children, but she isn't on the bad side. She had a totally normal life, untill that methot started and her powers were switched 'on'. The story is well thought of and it had a interesting twist that I didn't expect. The world building is also on a good level. Story - 8/10

Now, let's see if the characters are that great.

I won't lie. They're problematic. At the start we see the characters in a very odd light, creating us a image of them in a completely wrong perspective.
Kazuki in his introduction is portraid as a total asshole, that doesn't get along with anyone and will punch you no matter who you are. But in the other chapters he's just a kind of a jerk and a good guy.
Tsubomi is looking like a caring friend, an ally, but when she comes back she is with a completely new personality.
If you think that I'm mistaking character development for this, that's not the issue. The characters just go away somewhere without a trace and when they return they're a totaly different. Even if they develop their personality we never get to see it.
The other issue I have with them is that sometimes their actions can be repetitive.
After Wakaba switched 'on' her powers she started talking how anybody that came close to her would die, but then it was discovered that she said it so everyone can avoid her because she can not control her power so she can be a potential danger for the people around. Okay that was interesting. Then some chapters later Tsubomi started talking how she will be ready if there's a battle and a second later she was just joking around.
And after that again, some chapters later Wakaba's father told her how he will be ready to kill her if she stands in the way, but suprise - it was only so he could protect her.
Still there were really well done characters and the ones that had the starting issue became much better. The writer can even make you care about the minor characters like Miho, her backstory was good and I think that it was the reason I care about her.
Their designs are also not much. If there's good there's bad. I really liked the designs of the high level members of the tsubomi methot - they look like the police men that go to keep the protests from escalating to something more dangerous and you can see clearly that they're a high class compared to the ordinary members of the tsubomi methot.
I didn't liked the design of 'Woke' Wakaba. Dress made from blood? Honestly I think that it would have been better if the writer was going with something else for design. Characters - 5/10

Visuals: The manga looks good. The art sometimes looks very pale (even for a manga) but that happens rarely. There are some pages where the art really stands out. The manga looks unique because of the style Sayaka Mogi (The writer and artist) haves. You can recognize his drawings for seconds. Visuals - 7/10

Enjoyment - I really liked the manga. Even if the characters have some issues you should read it for the story. Don't miss the chance to read it. It's really good. I will love to see a properly made anime adaptation of the manga with the problems fixed. Enjoyment - 7/10

Overall: 6/10 - You should read it for the story.