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.

Based on the Amagami love simulation game. The focus is on Tachibana Junichi's relationship with Tsukasa Ayatsuji. The second arc focuses on Kaoru Tanamachi.