A Gray Rain Is Going to Fall

Is this Japan in the near future or a place that closely resembles Japan In a town where the weather forecast always ends with an announcement about a dull rain people live their lives constantly worrying about the rain The dull rain is said to be the vapour that forms when a substance called HUAN in the air combines with another substance called Violence VIOLENCE which rises into the sky and forms clouds However neither clouds nor rain is visible to the human eye nor do we know what happens when they fall