Ibitsu was a really great manga. What made it so great was the storyline and how it basically mindfucks you at the end. There are also 2 other side stories that the manga shows and are also fantastic. The mannequin side story is better than the other one, but nonetheless it just did a great job of giving the reader even more chills. Now the main story didn't really scare me, but it definitely built me up with suspense. Her murder techniques weren't all that creative or different (*one of the ways she killed her victims though was SO good though), but the storyline and the plotwist at the end are so worth it. Characters were all right, but the ones who stood out were obviously the murderous lolita girl (throught the whole story, her design was really creepy :3) and the main character Kazuki (especially towards the end.) I really recommend this.