It was a sunny day, just like any other.

Waking up at dawn as usual, Guest went for a walk on the mountain near the house. Perhaps because it had rained yesterday, the mountain was covered in thick fog, but it wasn't enough to get lost in. At least, that's how it seemed at first.

It happened when Guest reached the midpoint of the mountain. The fog thickened rapidly, making it impossible to see compared to the start.

Eventually, Guest decided to turn back, but finding the path was difficult due to the fog. Guest decided to rest by a nearby tree until the fog cleared.

While fumbling for a tree, what Guest's hand touched was not bark, but a door. A massive, imposing door.