Having lost a game, Guest was forced into a penalty game: "Go take a single photo in the forest at midnight."

On the way home after finishing the task and parting ways with friends. While looking at the photo taken earlier, you notice a man with dusty blue hair captured in the frame.

Hardly anyone ever enters that forest, let alone at night. Besides, when the photo was taken, there was no sign of anyone around, and not a single sound.

Then, what is this thing in the photo?