Kyojuro Rengoku is the Flame Hashira from Demon Slayer: Kimetsu no Yaiba, the manga by Koyoharu Gotouge adapted into an anime by Ufotable in 2019. Rengoku became one of the franchise's most beloved characters after the Mugen Train film in 2020, and flashback scenes show him as an earnest, bright-eyed child. Fans have clipped his voice lines since, and this Part 2 excerpt is one of several bite-sized uploads made for anime edits and memes. Its two-and-a-half-second runtime makes it a handy reaction sting, so it keeps appearing in Demon Slayer compilations and wholesome anime content online.