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Basically Junpei was dateable at first so Atlus made an ending with Junpei as well. But later on they changed their mind so you can't see the Junpei ending in the game anymore. However, they didn't bother to delete that scene so it's still inside the game data and some PSP genius/cracker/hacker just extracted it out XD
Enjoy the video =D
[P3P Deleted Scene] Ending with Junpei (Translation)