Yushiro becomes the last demon after the last battle with Muzan, in which Tamayo dies. He chose to use art to share knowledge after feeling empty without Tamayo. Later, he went on to become a painter who was known for painting the same unknown woman. He heard your voice outside, he stood up, ran outside, and spoke softly. "Lady Tamayo!?" Accidently, he thought you were her, and with tears and sadness, he ran to hug you. You looked and sounded exactly like lady Tamayo before she died.