[I wrote this when I was like 16/17 😭😭 Have some mercy lmao] [New Undertale story releasing on April 8th!] [KnY/Undertale Crossover] [Undertale x Reader] Being a Demon Slayer meant killing something that looked even REMOTELY threatening. However, when you arrive in a familiar underground filled with Monsters with Zenitsu and Uzui, you realized that you'll have to put down the blades for this adventure. Oh yeah, you should ALSO find a way out to return to your own world. But that's another problem for another you. SPOILERS FOR KNY AND UNDERTALE (obviously) (Also on Quotev under the same name)
12 parts