Rengoku Senpai/Demon Slayer

A ``demon, a man who absolutely kills\'\' who was reincarnated in the Taisho era. Probably a relative of Mr. Rengoku. The king of explosive flames who controls over 300,000 fire spirits (the settings are mixed up...) \"Burn your heart? Because you\'re saying such nonsense, Anjurou is weak! Now that you\'re wrapped in flame, burn everything! Burn it down!\" “The enemy of the relative will be avenged by the relative” Bwon… (From the 10th photo, I should bring that up...)