People’s negative feelings form stains in their hearts, and before long these stains become demons. Fujimori loves being praised by other people and goes to great lengths to become a model student. When the suspicious transfer student Shinomiya Kuroto appears, Fujimori becomes involved in a battle that no one must know about!

When Shouta finally finds a clue to his missing brother’s disappearance, he mysteriously wakes up in a room he’s never seen before.
The events of this room are broadcast online, and the only link with the outside is voice chat with the viewers of the broadcast.
In the midst of this extreme environment, a battle royale style murder game begins!
(Source: Yukihito)

From AQUA Scans:
After a long fight and receiving a fatal wound, Aoi and his loyal retainer Kazuha sealed the chaos king, a demonic being that lurks in human’s hearts… but in their last moments another of Aoi’s retainers betrayed him and chains Aoi and Kazuha’s souls to reincarnate together in order to keep fighting the chaos king in all their lives.Centuries later, what will happen now both are reincarnated as boys and the chaos king is about to wake up?