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Kaiyochi's Nichirin Sword turns bright red in conjunction with his Demon Slayer Mark after attacking Yotsuyahi with Nova Breathing, Sixth Form: Nebula, Raging Punishment at an extremely high speed, resulting in increasing friction.
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When Kaiyochi attacks Yotsuyahi using his Nova Breathing, Sixth Form: Nebula, Raging Punishment technique at an incredibly fast pace, it results in increased friction. As a result, his Demon Slayer Mark and Nichirin Sword both glow a brilliant red.