Towa Higurashi learns about an incident that took place decades ago involving a half demon named Inuyasha and a priestess named Kagome.

Half-demon twins Towa and Setsuna are separated from each other when Towa is hurled into the future, where she is found and raised by Sota Higurashi.

Towa decides to help Setsuna regain her memories. The trio enter the corridor leading to the feudal era, but within it awaits a certain spirit.

Towa, Setsuna, and Moroha head to the northern mountains to find some missing travelers, but instead they find a village overrun by ghost cats!