Koujo Denka no Kateikyoushi

After Allen failed the court sorcerer exam, he couldn't return home even if he wanted to. While searching for a job, an unexpected offer comes his way to be the private tutor of the duke's daughter. Just as he lowers his guard, he faces a girl who can't use magic at all! But what is preventing her magic from working? Allen's unconventional lessons gently shine a light on the girl's future.