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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.

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.

After swiftly executing the Nova Breathing technique, known as the Sixth Form: Nebula, Raging Punishment, Kaiyochi witnesses his Nichirin Sword transforming into a vibrant shade of red. This incredible change occurs simultaneously with the emergence of his Demon Slayer Mark, as his assault on Yotsuyahi generates immense speed, leading to heightened friction.