Two humans end up in Equestria due to a salesman selling oddities and trinkets within a small comics convention, and are now stuck as their costumes. One has a slight case of amnesia, and rememberes himself as Karkat Vantas from Homestuck, and another, his girlfriend, as Ashley from Wild Arms 2.

The two are now stuck, and have to find a way go get into good standing with the princesses, and Celestia's student, Twilight Sparkle.