I don't know how to categorize this anime: It is obscene, violent, dark and disturbing for some audiences. It is classified as ecchi and yet it should be hentai.
If you overcome the first episodes you will be trapped in the story and you will not stop to see how far the main character will go to fulfill his cruel revenge.
If you overcome the first episodes you will be trapped in the story and you will not stop to see how far the main character will go to fulfill his cruel revenge.