On their wedding night, he berated her until she was utterly humiliated, but she didn’t cry. She simply copied scriptures day after day, brewed medicine, and tucked a hand warmer into his arms, caring for him like a cat with its fur standing on end, slowly melting a thousand years of ice.
Later, when someone poisoned her, she didn’t die. Her Blood Demon Art, “Ink Stain,” awakened in all eight forms. She became Upper Rank Zero, the only one who could tighten a noose around Muzan’s neck.
During the final battle at the Infinity Castle, Muzan came crashing through the sunlight. The Demon Slayer Corps had broken blades and shattered swords, and were exhausted and despairing. But the eight-year-old young master stood up, holding his father’s bloodstained final letter. “We’re done fighting. Let’s all go home.”
The demons survived, and the Demon Slayer Corps disbanded. Tamayo brewed flavorful wine, Yoriichi and Kokushibo shared a cup of tea every day, and the three butterflies took off their uniforms to grow flowers and practice medicine in the herb garden.
And she, holding the “cat” she had rescued from the abyss,
walked step by step into the true sunlight.
[I’ll give you an ending where everyone survives.]
So pretty.