High-school freshman Hodaka Morishima runs away from his home and moves to Tokyo. On the trip, he almost gets thrown off a ferry when a freak rainstorm hits it. However, he is saved by a man named Keisuke Suga, who gives Hodaka his business card in case he ever needed help. In Tokyo, he struggles to support himself because he is unable to work legally due to his status as a runaway minor. After being kicked out of a lift lobby that he had been using as a shelter, he finds a gun (Makarov 9mm) inside a trash bin and then keeps it as a lucky charm, thinking that it was only a toy. He briefly encounters Hina at a fast-food restaurant where she works at. She takes pity on Hodaka, giving him a free meal. Hodaka contacts Suga and is hired as an assistant to his small publishing company. At work, Hodaka meets Natsumi, Suga's niece who Hodaka mistakes as his mistress. They investigate urban legends relating to the unusual weather in Tokyo; from a psychic, they hear the legend of a 'sunshine girl' and a 'rain girl'—a girl who can control the weather. However, the use of weather capabilities comes at a price. The user may disappear.