The Amazing Mages — Goldeen Ogawa

Miss Vitronica Mage is the youngest of four children who have all mysteriously disappeared on the eve of their 21st birthdays. Now about to turn 21 herself, she comes to Bouragner Felpz in a desperate attempt to save herself, but what Felpz discovers when he investigates the case proves to be far more intricate than what first appears. And Corianne, his faithful ward and biographer, is forced to take a much more direct role than she would like, considering there could be a demon involved!