サーヴァント ビースト

Deceived and then put up for sale at a black-market auction, therianthrope Hal is bought by the sinister and widely feared Bone Witch. Hal, forced to become the witch’s familiar, is ordered to do everything from housework to shady dealings—such is his plight. However, as the two spend more time together, Hal’s earnest and amiable nature gradually begins to thaw the witch’s icy heart. Hal is touched by the witch’s clumsy kindness, and a familiar’s loyalty begins to sprout in him… (Source: Yen Press)