Black Sigil: Blade of the Exiled tells the story of Kairu. He is a boy without the power of magic. Unfortunate for him, the last person to not have magic was also an evil mastermind, Vai, that plunged the land of Bel Lenora into darkness. Needless to say, people are getting edgy that Kairu can't cast a spell to save his life. His adoptive father, the Duke who vanquished Vai, has no choice but to banish Kairu. The ever loyal Kairu is on a quest to prove his innocence and embarks on his journey to be a great knight.