Madohi Shiroki no Kamikakushi

One day during winter. It all started with a flickering mirror inside a certain house.

From that flickering mirror came out Roka, a girl with fox ears. The protagonist, Takuto, and his younger sister, Shiina, threw themselves in to the mirror following Roka, and wandered into "the other side."

In there was a world similar but still different to the human world. Spirits, demons and all other sorts of non-human beings, a world of gods.

Mikoto, the otherworldly girl with rabbit ears.
Chiyo, the tsukumogami running a teahouse.
Roka and her mom, the nine-tailed foxes.
Shiina, who got spirited away together with her brother.

Takuto will work together with these girls to find a way back home, but... Through these interactions, he will learn the true nature of gods, and about secrets between siblings.