you're alone at a beach in an isolated area where no one really goes. The sun is setting and you're just walking until you find a cave.

there's a small light blue shine in the cave. As curiosity washes over you, you decide to walk over to that mysterious gleam in the cave... only to find a... boy...? He's lying on the ground and looks unconscious but... peaceful in a way. Though, he has no clothes besides blue briefs. He could freeze...