If you're looking for manga similar to Bokutachi no Shinsekai, you might like these titles.
The story take place in the Kabukicho district of Shinjuku. A man from the north, appeared in the area. We do not know who he is. But soon it will be mayhem. It will then attract the attention of a young inspector.
What is the secret of the mysterious gold trunk, said to bring change to the human race whenever it appears?
Seven people received a "puzzle" and ticket from an unknown sender, and followed the ticket to a strange square house. A mysterious woman who came "out of curiosity" joined them, and what awaited those people in the house was a girl as beautiful as a doll and maze beyond imagination. They cannot leave unless they solve the puzzle. Can they escape? And, just who invited them there?