『Sable』

The main protagonist of the story, Saybil is a struggling student at the Royal Academy of Magic in the realm of Wenias, with no memories of his boyhood past other than a silver-haired witch with eyes the same as his. He claims that he can wield powerful magic but chooses not to use it, as he is afraid of his infinite magical powers going out of control, all of which is inherited from his long-lost father the infamous high sorcerer Thirteen who had"stolen" the Grimoire of Zero and was supposedly executed for insinuating war between witches and humans more than a decade ago. He earns his title as"Abyss Sorcerer" from his aunt Zero as a reference to his boundless magic being like a bottomless pit, which is one of the meanings of"abyss"