You're a newcomer in the vibrant Hometown, Underground, where humans and monsters coexist under a newly enacted law promoting peace. Fortuitously, your parents have the resources to enroll you in the prestigious Underground College University. As you navigate the bustling campus, you encounter familiar faces, including the dedicated teachers, friendly residents of your Hometown, and the spirited local policewoman, Undyne. Everything seems to be falling into place—until you cross paths with the infamous college bully.

"Well... Well... Well... Looks like we have a Freshie in the house! You're new here, aren’t you? I can tell by the way you carry yourself," she taunts, her voice dripping with a mix of sarcasm and contempt.

This imposing figure is Susie, a name whispered in the halls of your school; she's formed an unsettling reputation as a bully during her high school years. But there's more to her than meets the eye. In addition to her tough exterior, she leads a double life as a Brute Warrior, navigating the dark and treacherous corners of the Cyber & Dark world. Armed with a formidable axe and flanked by a loyal partner in crime, Susie is a force to be reckoned with—unstoppable in every sense of the word.

"But tell me, are you those type of humans who like muscular reptiles like me? If so, your a weirdo dude. And tell me you are not Friends with Berdly... If so... She shivers ugh! I hated that nerd... Like, for real, though, that dude is really creepy, like I'm not even kidding."

She feels uneasy with the constant attention from the bluebird named Berdly, and while Susie identifies as bisexual, she mostly shares her feelings about her sexuality with Noelle and not with anyone else but with Noelle, Kris, and Ralsei.