Kyojuro Rengoku is the Flame Hashira in Demon Slayer: Kimetsu no Yaiba, and his Ninth Form, Rengoku, is the signature technique he unleashes during the Mugen Train story. The Japanese audio captures his shouted technique name over a blazing slash effect, a combination that fans clipped and shared widely after the film's release. Because Rengoku's stand became one of the series' most emotional moments, the sound remains popular for edits that need heroism, sacrifice and a decisive final blow.