"A holy night with no dawn, my dear..." Shuu awakens, memoryless, in a town blanketed in snow that feels truly bizarre to him. In this town filled with Europeanized architecture enveloped and closed off by a humongous wall called the aurora, there is nothing more treasured than the arts. It is here in this mysterious town that Shuu is saved by its residents and allowed to live a fulfilling life with the students of St. Aria Academy. However, this blissful life is eventually taken away from him in the blink of an eye. On December 25th, an unexplained conflagration brings the town to almost complete destruction. Loving this town more than anyone, Yune decides to take destiny into her own hands and rewinds time back to December 2nd—the first day of Advent. Why did all this destruction happen? Why is it that no matter what they do differently in the past, it all still leads to the same future? Why is it even possible to repeat these days in the first place? And what is this miraculous blessing, this “Amazing Grace" that is said to come on Christmas? The truth that awaits at the end of this endlessly-repeating loop will be written on this canvas of a town by their own hands.