Demon Slayer (Kimetsu no Yaiba) X Super Smash Bros Ultimate. . . . . . . . . Have you ever wondered what would happen if our beloved Mist Hashira got the infamous invitation to join the battle? This story is just about that! Join Muichiro Tokito as he ventures into the smash mansion after getting invited...how will things play out? We'll see. . . . DEMON SLAYER BELONGS TO KOYOHARU GOTOUGE THE SUPER SMASH BROS SERIES BELONG TO MASAHIRO SAKURAI.