A high school boy runs away to Tokyo, finding himself broke and isolated in the incessantly rainy city. Seeking shelter and employment, he stumbles upon a small, struggling publisher of an occult magazine, who takes him on as a live-in assistant. As the rain pours down without end, the boy's desire for a purpose and a brighter future become almost as palpable as the city's wish for a clear sky.

During his escapades in Tokyo, the boy encounters a bright and strong-willed girl with an enigmatic ability: she can summon the sun with a prayer, temporarily dissipating the rain and bringing relief to the waterlogged city. Fascinated by her power, he joins her in capitalizing on this unique talent. Together, they embark on a business venture, offering weather-changing services to a variety of clients. As their bond deepens, they unearth the weight and the consequences that accompany the miracle of sunshine amid the unending downpour.