Corpse Party: Painful past

*DO NOT READ IF YOU DO NOT KNOW THE MAIN STORY!!!!!!!!!*

Ayumi Shinozaki has a painful past. Her long lost friends: Mayu Suzumoto, Seiko Shinohara, Sakotarou Morishige and Yui Shishidou have their souls trapped in a dimension with multiple fates that cannot be changed. Ayumi feels its all her fault, and so she wants her sins to be forgiven... but there's only one way...