In this world, there are witches as well as a science of 'witchcraft'. However, the art of 'magic' is still unknown... Escorted by the half-man, half-beast mercenary to whom Zero has promised to return to human form once his quest is accomplished, the strange witch is in search of her grimoire stolen. The young wizard Albus claims to be able to lead them there, and the three of them head towards the village where it is kept. However, they are unaware that a terrible surprise awaits them...