Demon Slayer: Kimetsu No Yaiba: the Return of Love Snow

The reincarnated girl Yukina awakens the breath of ice and snow, and grows from a crybaby to the youngest pillar of the Demon Slayer Corps. Sanyi, the fateful enemy, turned out to be the unmarried lover from the previous life. This time, she will use the Ice Flower Blade to cut off the centuries-old curse, bring him back to the light after falling into darkness, and protect everyone.