A winter story. Kihara Yuuji, Sawaki Yuriko and Sakagami Yuzuki. A trio of best friends, two of them recently being a couple and the last blessing and watching over them. A short happiness that suddenly escapes everyone's hands as tragedy strikes and kills one of them. This is a story where the protagonist tries to overcome such a sorrow. The unforgiveable sin that is love. An eternal damnation. An unavoidable and cruel destiny. Unrequited feelings. And, caught in the middle, good and kind people who are in the end but innocent sacrifices.