After Corpse Party. When Morishige's spirit encounters two newcomers to Heavenly Host Elementary School, he asks for a favor that spawns an irrevocable set of events. Will he finally break free with the one person he cares most for?

Set 4 years after S1. When Lily's friend talks her into sneaking into the murder house, tragedy strikes. Now Lily is stuck in the house, finding herself attracted the most dangerous spirit in the house...