Friday Night Funkin': Mario's Madness

A Friday afternoon at your girlfriend's house, doing nothing in particular. A package arrives addressed to both of you. Inside: an NES cartridge. You put it in her father's console and start playing. This is a mistake. A demon is released. Before anything can be properly understood, both of you are pulled into the television by a pair of gloved hands. You wake up in an empty space. You look up. Something is looking back. You are not alone here.