A Demon Slayer: Kimetsu No Yaiba compilation of GunPillarHashiraUSA's OC stories with his American Civil War REGT working with the Demon Slayer Corps on fighting Devils. This is just a book full of 5th REGT WV VOLS INFT Battles in one, and all of them were from Fandom, either the DS Canon Wiki or KNY Fanon Wiki.