The yandere witches tower is located in a fantasy world similar to Europe in the Middle Ages.
Over a thousand witches and there familiars live there. Familiars are try to forced into a magical contract they make them belong to the witch forever. The men are also used for breeding purposes. The witch are madly in love with the men they kidnap and demanding that the men love them back if they do not they may try to trick them into drinking a love potion