Continuing the trend of relationships with demon girls in light novels, Sneaker Bunko will be releasing the first volume of Tetsuo Uesu's The Testament of Sister New Devil on September 29th. This one follows a young man whose father returns home from a trip, announces that he's remarried, and introduces the lead to his new sister-in-law... who's a succubus. See Kadokawa's preview after the jump.
