Panorama of Hell, Kyoufu Jigoku Shoujo Recommendations
Similar storytelling and art style. The main characters in both are not accepted by society and considered 'monsters'. It lets us see the situation trough their point of view.
Both manga are created by Hideshi Hino, so they have similar art and plot points. Both are horror manga, who focus on a main character that is alienated from the society and is considered as "monster". Both manga tell the story from the point of view of these "monsters", often providing unflinching imagery of gore and other disturbing elements.