InuYasha the Movie 2: The Castle Beyond the Looking Glass (2002) Anime Watch

Fortune smiles on Inuyasha and his allies when they finally defeat their nemesis Naraku, who has caused them unrelenting hardships. Overjoyed by the long-awaited victory, they all hurry to resume their former lives, unaware that danger still lurks around. Kanna and Kagura, two of Naraku's subordinates, make arrangements to set free a sealed demonic entity that claims to be Kaguya, the legendary Princess of the Heavens.

Although preoccupied with their own endeavors, Inuyasha's group members reunite by a string of unusual coincidences involving Kanna and Kagura along with an inexplicable phenomenon of repeated full-moon nights. Upon realizing that Kaguya is behind the troubling events and that she holds a terrible power, they join forces once more to stop the disastrous fate she has planned for the world.