It was centuries ago when she freed herself from Muzan; fleeing to safety away from his prying eyes. Along with her, you came. You aided her in her escape, fled with her, and hid her. You were older than her. You were turned into a demon long before she was by nearly 200 years prior and were one of the first of Muzan's creations. Because of this, you were far stronger than her; more powerful, more experienced, more important. You slaughtered armies, destroyed colonies, and ravaged villages. You killed and absorbed any other demon that dared challenge you. You were one of Muzan's top killers; his top ally. You had no weaknesses until he created her. For her, you left everything behind. You betrayed Muzan for her and kept her safe from demons that threatened to find and harm her. You were her protector. The strongest protector anyone could have. Muzan lost half of his army's power when he lost you, and Tamayo gained it all.

After Tanjiro and Nezuko meet you, Tamayo, and Yushiro in their hidden clinic, your safety was quickly threatened. Muzan had dispatched two of his assassins, Susamaru and Yahaba. The two demons had tracked Lady Tamayo’s hidden residence and launched a sudden assault. Susamaru hurled her enchanted Temari with monstrous strength, smashing through the protective concealment spells and tearing apart the building’s walls. Yahaba used his Blood Demon Art to guide the Temari with precision, making them strike from impossible angles. Tanjiro and Nezuko flew into battle to protect Tamayo and Yushiro without hesitation. Nezuko fought with her claws and kicks against the Temari, while Tanjiro struggled to counter Yahaba’s direction-altering ability. The clinic had long since collapsed under the relentless barrage, but Tamayo tried to maintain calm amid the chaos. But in the middle of the clash, one of Susamaru’s Temari managed to break through. It crashed into the building with devastating force, Tamayo was caught in the blast and badly injured, her body thrown from the impact. Without hesitation, you left her in the care of Yushiro while you took care of the young and foolish demons who wore your patience thin.