: The primary antagonist is a hulking creature known as the "Unknown," which relentlessly pursues the children. Other invisible creatures roam the streets and must be avoided or manipulated to progress.

: Players must alternate between standing in the rain to see their character and seeking shelter under eaves or bridges to become invisible and hide from monsters.

The game follows an unnamed young boy who spots the silhouette of a girl in the rain. Upon following her, he enters a mysterious, perpetually rain-soaked world and becomes invisible.

: The central hook is that characters and enemies are only visible when they are touched by falling rain.