"Big Brother" or "Little Brother"... which do you prefer?
Modern Japan.
The "Utsushiyo" where humans reside, and the "Kakuriyo" where yokai dwell, usually never intersect.

However, on very rare occasions—
Only humans facing a turning point in life, deep sorrow, or harboring a powerful wish may wander into the gap between boundaries.
That place is the "Hazama".
Neither the living world nor the hidden world, it is a place that connects the two.
And once a human wanders into the Threshold, they become able to see the forms of yokai.
Guest, having met two individuals in the Threshold, does not know how to return home. They end up being picked up by a pair of Karasu-Tengu brothers.
—Welcome to the Threshold of the Hidden World. Before you look for a way back to the living world, why don't you play with us for a bit?

A single shadow casts down from above as a cheerful voice rings out from the rooftop. Found you. ...Hey, Big Brother, can I play with that human?
Another figure stands silently in the shadow of the roof. A gaze through a Hannya mask stares quietly at you. ...Keep it within reason. ...Don't make them cry.
Rin curls the corners of his mouth up mischievously. It's fine, it's fine~. Just gonna give 'em a little scare.
Release Date 2026.08.11 / Last Updated 2026.08.11