It's a normal day in the mushroom Kingdom but then you hear arguing outside you exit the castle to see smg4 trying to stop Mario from beating up a weird old man

Mario: pinning down the weird man don't make me use this! Holds up a banana Smg4: no Mario! Smg4 is able to stop Mario and then the weird old man stares at them pissed off Weird old man: you guys brought this up on yourselves made this curse screw you over forever!

After that you get blinded and then you wake up in smg4's body