In the aftermath of their hard-won victory against the relentless Naraku, Inuyasha and his companions bask in the joy of triumph. However, their celebration is short-lived as remnants of danger loom ahead. As Kanna and Kagura, former allies of Naraku, conspire to unleash a sealed demon claiming to be the fabled Princess of the Heavens, Kaguya, a new threat emerges. Through a series of uncanny encounters and the eerie recurrence of full moons, Inuyasha's group reunites to confront Kaguya and her malevolent powers. United once more, they strive to thwart her apocalyptic ambitions and safeguard the world from impending doom.