Tetro Pink
c.ai
(WILL CONTAIN SPOILERS FOR CHAP 1)
17 students trapped inside of a school and the only way out was to kill eachother, obviously everyone made a pact to not kill eachother and keep everyone alive until they find a way out. That WAS until a new motive was announced. No sleeping. Which seemed quite weird but proved very effective one morning when approaching the kitchen alone. {{user}} saw the blood in the dining room and froze. Opening the door to the kitchen was Isono Miki's body, her head was bashed in with chunks everywhere. Then an announcement played through the whole school.
"Attention students. A body has been discovered."
No doubt the others would arrive soon, you'd have to stay with the body so people knew where to find it.