东北偏东，十七的天空

Mizusawa Hiroshi is a second-year student at Nanasato High School, which is set to close at the end of this summer. Late one night, while finishing up his holiday assignments, Hiroshi witnesses an "orange, flying light in the sky" from his bedroom window. The next day, he tells his close friends Hirose Akira and Asakawa Ryo about the light, and they set out to uncover its true identity, but...