Saku's astronomy club participates in a winter stargazing camp with the girl from Takami Girl's School, who also participated in the Autumn Stargazing Conference. Saku, Edogawa and especially Hime do not dress warm enough, and while Saku and Edogawa brought more warmer clothes, Hime cannot dress in layers with the extra clothes she brought. After spending the first day freezing, Hime goes out at night to go to a local convenience store, but it is already closed by the time she gets there and a blizzard is blowing in. Hime tries to get back to the cabin, but quickly gets lost. The others notice she is gone, and also suspect Mihoshi went out to search for her. With Hime close to freezing to death, Mihoshi finds her and the two wait out the blizzard in a small snow cave. They find they were not far from the cabin and while they are scolded for what they did, everyone is relieved to have them back safely.
Saku Oyagi returns to his old hometown in order to start school at Soei High School. On the first day, he runs into an old childhood friend: a second year named Mihoshi Akeno. As children, the two used to play together, with Mihoshi, or Mii-chan, being extremely fond of astronomy. After convincing Saku to join the school's astronomy club, another girl, Hime Makita, joins the club in hopes of winning over Saku. This is the story of the 6 club members of the Soei High School Astronomy Club as they soar through their lives, each maturing and changing their outlooks on life.
