This is a great psychological thriller manga.It have an intelligent plot, Unpredictable plot twists, Memorable deep characters & overall atmosphere of the series. I was surprised at how well-written this manga is, it maintained a constant level of quality throughout the 18 volumes. Whenever I read it I just couldn't stop. Monster's atmosphere and cliff hangers left me at the edge of my seat every time, always leaving me waiting for more, that's how a thriller is supposed to be. And it is always give us reader intense & tension while the plot peak happen .Coz by the unpredictable plot,will always be surprised of the truth.