Muichiro's Demon Slayer mark - Demon Slayer Season 3 Episode 8

Muichiro unlocks his demon slayer mark in the battle between gyokko

Demon Slayer: Kimetsu no Yaiba Swordsmith Village Arc
Kimetsu no Yaiba: Katanakaji no Sato-hen; Demon Slayer: Kimetsu no Yaiba Swordsmith Village Arc

Demon Slayer: Kimetsu no Yaiba 鬼滅の刃

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