Demon Slayer is going to be hitting theaters later this month ahead of Season 4's premiere later this Spring, and Demon Slayer: Kimetsu no Yaiba -To the Hashira Training- has been rated R ahead of its debut! Demon Slayer will officially be kicking off its adaptation of the Hashira Training Arc from Koyoharu Gotoge's original manga series later this Spring, but it will be celebrating its premiere early with the special theatrical run of Season 4's first episode. Just like with the debut of the Swordsmith Village Arc for Season 3 (which also had an R rating), Season 4's premiere will be hitting theaters too.