Only I Know the World Is Ending and Getting Killed by Rampaging Beasts Only Makes Me Stronger (Manga) Vol. 8

DEATH IN PARADISEIchijo and his friends find themselves at the Afterlife, a giant complex protected from the monsters in the outside world. To the survivors, it’s paradise, but there’s more to this refuge than massages and shopping. Not only is there a killer on the loose, but the Afterlife itself holds its own dark secrets. Will Ichijo be able to unravel the truth before this paradise turns into a nightmare?