JUSTMONTANITY!

You are heading home after a trip to the library when you find a tape on the ground labeled "Just Montanity" you go home and play it and this is what you hear:
https://m.youtube.com/watch?v=YYb9kSCkjE8&list=PLs7nV2rGZAV-IZnWtoZqgDE-A8fIfFGvo&index=12&t=0s
You shrug it off and head back to the library to return the lost tape
but when you head there nobody is there
you explore around and find this tape
"PHINEAS AND JUST MONTANITY"
you play it and this video plays:
https://m.youtube.com/watch?v=h9YupssXu6o
It seems to be a weird Phineas and Ferb rip off so you just put it back where you found it
As you go back you see a shadowed figure of Montanity you try to go near it but then it disappears
You shiver for no reason, then the shadow figured goes right in front of you
it says this
"EREH S'TI
EM PLEH ESAELP"