Very simple. This series has no depth, the character development is so simple that you can easily guess how it is. This biggest point of the series that will make you crazy is about the stupidity of the Main girl as she was born to be a burden so that the Story won't end too soon. If this was the first time you read this kind of revenge story it would be pretty interes....Urg, I don't know.
But since I have read so much of this genre while it is so saturated, I'd rather throw it away.

Art: 6.5/10
The environment looks like Keneki and Friends, but not the character
Wonder if author has something relates Tokyo Ghoul and other typed of style like that, it goes well with the story actually

Story: 6/10
Simple story, no depth, but still have something to read as I mention above

Character development: 5/10
Simple story, no depth, but still have something to read as I mention above
Except everyone needs to go to the hospital for mental, psychotherapy

Dark Vibes: 7/10
Well, this is revenge story after all, so it might looks good to begin and go along with

Combine: 6.5/10
But...Well...The Main girl are designed to be a retard and it keeps making me confusing about the story lines like...I don't want to spoil. So Over all it would be 3/10, thank you as ALWAYS, girl :)
This type of girl will make Sakura and Aqua being useful as there hasn't someone worse than her.
Thank for reading my review