If you're looking for manga similar to Ningen Kaishuusha, you might like these titles.
Welcome to the classes of horror! I will be your guide to a world that lurks under everyday life. For these lessons, you don't need text books or notebooks. If you're prepared for the worst...
The Flame Dragon Knight traces the rise of the warhammer-wielding warrior Grunbeld from humble beginnings to become the all-powerful Apostle who will one day face Guts in mortal combat!
Marie is trapped in a horrible situation. She's being constantly tormented by her classmates and regularly molested by her teacher. With nowhere else to turn, she finds herself asking for supernatural help from one of the seven demons of the seven mysteries of her school. All she desires is the death of her cruel classmates and teacher. How far will Marie be willing to go in order to achieve the murders that would free her from her living hell?
The "Johan incident" once spooked Germany. But the truth of the incident is still left undisclosed. This document is a vivid report of the "Johan incident" put together by an Austrian journalist, who found similarities between the "Johan incident" and a murder case that happened in the suburbs of Salzburg for which the writer was in the field. Are you ready to accept the striking reality that emerged out of the report!?