Mamiko Katakura is a Japanese music engineer who is best known for the music arrangement for the Shimajiro films including Shimajiro and the Rainbow Oasis, Shimajiro in Bookland.
The summer of his high school freshman year, Hodaka runs away from his remote island home to Tokyo, and quickly finds himself pushed to his financial and personal limits. The weather is unusually gloomy and rainy every day, as if taking its cue from his life. After many days of solitude, he finally finds work as a freelance writer for a mysterious occult magazine. Then, one day, Hodaka meets Hina on a busy street corner. This bright and strong-willed girl possesses a strange and wonderful ability: the power to stop the rain and clear the sky.
Teenage math whiz Kenji Koiso agrees to take a summer job at the Nagano hometown of his crush, Natsuki. When he arrives, he finds that her family have reunited to celebrate the 90th birthday of their matriarch. His job: pretend to be Natsuki's fiancé. Meanwhile, his attempt to solve a mathematical equation causes a parallel world's collision with Earth.
The Raven Consort is a special consort living deep in the inner palace who, despite her title, does not perform nighttime duties for the emperor. Some who have seen her say she has the appearance of an old woman, while others describe her as a young girl. The Raven Consort's name is Shouxue. She can use mysterious arts and will accept any favor asked of her, whether it is to find something lost or to curse someone to death. The current emperor, Gaojun, visits her one night to ask a favor. Their meeting exposes a secret that will turn history on its head...