At Seiyou Girls' academy, there are rumors of an angel. Our story takes place at the end of their second term, just before Christmas. Hina, Rin, and Fumi: three girls that became roommates since spring. The three of them all come from diverse backgrounds and have completely different personalities, but they share one strange similarity: They all saw an angel when they were younger. And they all gradually begin to suspect that one of their roommates might be the angel they've heard about...