In "Kimetsu no Yaiba: The Power of Darkness", we are introduced to Kaito, a young man who, after his tragic death, is reincarnated in the world of Kimetsu no Yaiba as the son of Tsukuyomi, the God of the Moon. Gifted with the rare ability Breath of Shadows, Kaito is chosen by the goddess Tsukuyomi to be her champion in the fight against the demonic forces that plague humanity. As Kaito grows up and trains hard, he discovers that in addition to his Night Breathing skill, Tsukuyomi has also gifted him with godlike powers. With his newfound strength, Kaito becomes able to manipulate shadows and darkness in a unique and powerful way, becoming a formidable threat to demons.