Unlike CORPSE-PARTY if, CORPSE-PARTY if PAST END only has one main ending. It has several new game overs that did not appear in CORPSE-PARTY if.
Spoiler Warning!: Spoilers for CORPSE-PARTY if PAST END follow

Main Ending

Game Over

Here is a listing of the game overs and how to obtain them:

Significant plot details end here.

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