Sakura Ooyagi returns to his old hometown in order to start school at Sōei High School. On the first day, he runs into an old childhood friend: a junior named Mihoshi Akeno. As children, the two used to play together, with Mihoshi, or Mii-chan, being extremely fond of astronomy. After convincing Sakura to join the school's astronomy club, another girl, Hime Makita, joins the club in hopes of winning over Sakura. The anime tells the story of the 6 club members as they soar through their lives, each maturing and changing their outlooks on life