Two years ago, Tachibana Junichi got his heart broken by a girl who didn't show up for a date on Christmas Eve. Now a second year student in high school, Junichi spends his days inside his closet planetarium, going to school and hanging out with his friends Tanamachi Kaoru and Umehara Masayoshi.

Volume 1-2: Ayatsuji Tsukasa arc

Volume 3-4: Tanamachi Kaoru arc

Volume 5: ?