Yuri was raised in the lower quarter of Zaphias. He joined the Imperial Knights with Flynn-Yuri's childhood best friend-but quit because he was disappointed by the Imperial Knights' corruption. Now he lives the way he wants, solving people's troubles in the lower quarter. One day, Yuri encounters a mysterious girl named Estelle. Upon discovering that she wants to meet Flynn, Yuri decides to accompany her. Yuri doesn't know it yet but this strange encounter will soon tangle many people's fates.