First of all, I don't believe this manga deserves the negative criticism it has on this page. I stumbled upon this manga because of the amazing yandere art style, and it definitely creeps you out yet is endearing in a similar vein to Mirai Nikki's Yuno Gasai. The obvious parallels of pink haired yandere with crazy eyes and blood etc. I found myself wanting to experience more of this feeling and happened upon this manga at a great time as Halloween was fast approaching. I can't say that it touched too heavily on the suspense or horror aspects of its story, but nevertheless I enjoyed it for the most part for the high quality art, ecchi aspects, as well as harem & Death Note-like or Lelouch-like human chess games.
Having read the entirety of it, I will say that it ended before it could really get into the deep aspects of what this manga could have been. Once the story latches onto it's primary arc, it drags on for a bit until it resolves, but the resolution is the actual end of the manga. It feels abrupt, but at the same time I am at peace with the ending, because I couldn't see the manga continuing on with the way it was paced. To put it into other words, I'm glad it ended, but I would have read more if there was more.
I hope you decide to give this a chance, if you're reading this because you're on the fence about it. 33 chapters is very short, the art is very good, and you can walk away with this and forget about it after a couple hours, but enjoy the very short time you spent here, especially if you're a fan of harem + Code Geass/Death Note like themes.