Astrologers' Fatalistic Theories

Arthur, who was accepted as a student by the continent's most powerful librarian, was born with the ability to astrologically. But he had nothing to do and used his ability to make weather forecasts for others until one day he met a strange trio and saw an even more strange fate in them. "You just stay here looking at the sky all day long. What on earth did we bring you here for?" Arthur: "The weather tomorrow will be cloudy and sunny."