Rengoku Deadroll

A high school student known for his exceptional intelligence and disinterest in simple tasks, Sakai Hiroaki tries to prevent a classmate from taking his own life but ends up dying in the process. Upon regaining consciousness, he realizes he is neither in the afterlife nor the world of the living, but in a transitional realm with others who died by suicide. He and the others are forced to participate in continuous, deadly trials with no clear purpose. Sakai seeks a means to leave this place.