"I want you to help me find the Oni"
So tells me the Tengu in the shrine I wandered to.

December, 22th.
Winter solstice.
The day where the shadows are longer.

The shadow inhabitants start to move.
A nocturnal game of tag.

"If you can find the Oni, I'll grant you one wish"
The main character, Shiawa, who wants to get happiness, starts to run in the long night...

[Translated from The Official website]