Koyoharu Gotouge Before Demon Slayer: Kimetsu no Yaiba summary: See how best-selling creator Koyoharu Gotouge, creator of the worldwide sensation Demon Slayer: Kimetsu no Yaiba, got started. This collection features four short stories packed with supernatural actionincluding a deadly vampire hunt starring Tamayo and Muzan that would serve as the direct inspiration for Demon Slayer: Kimetsu no Yaiba.