Beautiful girl mage Fontaine spends her days battling monsters. One day, she realizes her magical powers are gradually weakening. This is a sign that the "Witch-Killing Day," which she once heard about from a god, is approaching. Occurring once every few years, on this day magical abilities temporarily cease to function. Fontaine heads toward a shrine to restore her magic power, but monsters who have detected this information launch a relentless assault. Will she reach the shrine safely and regain her strength? Or will she fail to overcome this day, meeting a tragic BAD END?