Incompetent maze (1-4 volumes)

Publisher: Square Enix
Author: Shinichi Okada, Jita Yamada
Size: 128mm x 182mm
Number of books: 4
Language: Japanese
Category: Shonen manga, manga
Latest release date: 2018-07-21

Synopsis:
An incompetent labyrinth that swallows everything -If you don't solve it, you will be killed.
The trapped classroom, human fire, human beings turned into diamonds. Until two years ago, there were many terrible murder and missing incidents, and strange rumors were constant.
Now that we have become peaceful, the memories of the incident have diminished, and the residents have spent their days believing that the peaceful tomorrow will continue. However, when there is, the high school student, Ninomiya Yuhei, knows. The incident was not over. The existence of a labyrinth of death dominated by "incompetence" lurking in the darkness of the city ...!