Hunter's Harem

Hunter one day receives a package from his dead uncle. In there he finds a mysterious book of magic spells, the first of which allows him to magically hypnotize and enslave the people around him. In further studies of the book, he will discover a way to change the people around him even more, including their gender. He will encounter mysterious figures and learn dangerous secrets about a mad medieval wizard, his dead uncle, and his presumably dead father.