Since the victory of the Sorcerer Knights against the Inquisition, the Forest of Caillite has lost its timeless nature. Hordes of "Wooded", those people led astray in the forest throughout centuries, are now coming from it, completely disoriented. Thanks to the Crown Princess, Ocoho, who lifted the taboo on the nature of infections, all the orphans of Caillite enter the course to become Sorcerer Knights. A godsend for all? Among those wooded, Aquill, who left the forest a few months earlier, doesn't wish to become Sorcerer Knight. Only one thing is keeping him at the castle: finding his little sister, Tan, lost in the forest because of him...