Rengoku Katana
As an important character in 'Demon Slayer', Rengoku Kyoujurou was born into the Rengoku family and is the eldest son of the Rengoku family. His father was once entenka. The breathing method he uses is Fire's breathing, which is one of the five basic breathing methods. Although his father gave up guidance at a young age, he eventually became the entenka of Demon Slaying Corps by studying the guidebook on breathing techniques.
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