The Agent of Autumn, Nadeshiko Iwaizuki, and her Guard, Rindo Azami, were always together as their lives marched onward. But their peaceful days came to a close when the looming shadow of the insurgents descended upon them?Meanwhile, Rosei, the Agent of Winter, reflects on the day he met Hinagiku ten years ago. What happened then that changed the seasons? tides of fate? At long last, the stories of Spring and Winter become intertwined!