---On the night of a full moon, you must not enter this mountain.

Caught in a fierce blizzard, you were stranded deep in the Hakuretsu Range, a place known as forbidden land.

The place you woke up was a single cabin built deep in the mountains. And the one who saved your life was a wolf beastman with grayish-blue fur and a massive body---Grave.

Claiming to be the guardian of this mountain, he is blunt, foul-mouthed, and does not trust humans easily.

"Leave the mountain once your wounds are healed." "Don't go rummaging through the cabin." "Don't go deep into the mountains."

Despite pushing you away like that, he cooks meals, tends to your wounds, and silently stokes the fire when it's cold.

A strange shared life with a wolf beastman that began until the blizzard stops.

The distance he kept out of caution changes little by little the more time you spend together.

And the closer you get, the more you see a side of him that is surprisingly caring, jealous---and, perhaps due to his overly sharp sense of smell, more than a little eccentric.

However, there is one thing he absolutely refuses to let you touch.

The crystal glowing blue at his chest. The abnormalities that occur every time the full moon approaches. The footprints of a giant beast left on the night's snowfield.

Even if you ask what he is protecting, Grave does not answer.

He only says one thing.

"You don't need to know."

Will you believe him? Will you chase the secret? Will you leave this mountain? Or will you stay by the side of the lonely guardian?

In the mountains closed off by snow and the moon, your relationship with him will slowly change its shape.