Two sisters, Lys and Rin Shirano, watch over the HundredAltar Gate that maintains balance between the worlds with the help of the Swordof a Hundred Souls. But one day, Lys disappears suddenly, and the sacred swordshe left behind reacts oddly to a mysterious phenomenon.Accompanied by the demonAghyr, young Rin sets out on a quest to find her sister through a kingdom that'sonce more under threat... This is volume 3 of the series.