Riku Nanano 
Private Tutor to the Duke’s Daughter (Manga) Volume 2 [EPUB ebook] 

Ellie’s magical talents blossom, but Tina still can’t manage a single spell-and her impairment continues to mystify their tutor, Allen. Watching her maid and friend leave her in the dust only adds to the young noblewoman’s stress, pushing Tina ever closer to her breaking point. When she finally snaps, Allen is left to brave the resulting storm alone. To save himself and his student, he must draw on every trick he knows-including one he’s sworn to never use again. But can even his last resort carry the day when he comes up against a being beyond his wildest dreams? Meanwhile, a change in Duke Howard’s attitude poses a different sort of threat to Tina’s future.