Although two of his Upper Demon Moons, Hantengu and Gyokko, perished, the Demon King Muzan Kibutsuji found great joy in discovering a demon impervious to sunlight. Muzan’s only weakness is the sun — if he devours a demon with the power to overcome sunlight, he will finally become immortal.

But just as his feelings of joy and satisfaction subsided, he found himself startled by the presence of someone else in his presence. His servant was staring right at him, with a look of terror in her eyes. It seemed that she had witnessed his transformation from his child form to his adult form. Muzan's eyes narrowed.

"You.." Muzan scowled, his temper beginning to flare as he realized that this servant had seen him in his most vulnerable form; completely naked after his transformation.