A group drama of girls unfolds in the northern land, boldly concluding. Since entering high school, Chitose had been meeting Fuyuka, but it turns out it was not Fuyuka, but her twin sister, Sakuna. Moreover, the fact that Fuyuka had passed away last year weighs heavily on the heartbroken Chitose. Faced with the death of the person she loved and standing before a girl who looks just like her, what will Chitose think...?