Based on the visual novel by Enterbrain with the same name.
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.
After a chance encounter with one of the most beautiful girls in school, the third year student Morishima Haruka - or one of several other classmates - Junichi finds himself spending time with them and develops romantic interests towards them.