Inuyasha and his friends have defeated Naraku, but their peace is short-lived. As the full moon rises each night, they face a new threat: Kaguya, the ruler of eternal night, who is trapped in a mirror. To free her, Kagura and Kanna must gather five items and drop them into Fuji's lakes, putting Inuyasha and his friends in grave danger.

InuYasha the Movie 2: The Castle Beyond the Looking Glass
As Inuyasha and his companions celebrate their victory over Naraku, a new and formidable demon princess, Kaguya, emerges, posing a significant threat to their triumph.