Corpse Party

The end is nigh! Behind the truth of Sachiko's death lies a cruel and tragic past...The students of Class 2-9 struggle to hold on to their sanity as they fight both the ghosts of the school and the ever-encroaching Darkness that seeks to turn them against their friends. If they can't solve this mystery soon, it'll be too late! When living is this hellish, is death the only way out...? (Source: Yen Press)

It happened after school one rainy day... A group of friends have stayed behind to prepare for the next day’s school festival. One moment they are idly telling ghost stories but the next an enormous earthquake strikes and the entire school seems to fall down around them. They awake to find themselves trapped in a parallel version of their school. As school abandoned and disheveled and whose calendar dates back to 1927. Can they find a way out of this nightmare or are they doomed to the same fate that befell the other victims whose corpses that lie numerous throughout the school? Note: Chapter counts contains an extra chapter and an origin chapter.

There is a website for suicides appearing on the internet only at midnight and when certain specific keywords are searched. Although it is supposed to be only a mere urban myth, girls who have performed the ritual suddenly disappeared. High school paranormalist Naho Saenoki launches an investigation to shed light on this gruesome incident while the amount of victims keeps increasing. And then, it happened to Naho herself...