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While Basara, Mio, and Yuki have picked up their seemingly ordinary lives, they were attacked by magic-wielding humans when preparing for the upcoming sports event. Basara tries to become stronger by strengthening the testament when Rukia, Maria's sister, suddenly appears. Unknowingly, the war deciding the future of the demon realm has started. The Testament of Sister New Devil is an all-new, ongoing manga series based on a bestselling series of light novels of the same name. Combining action and comedy with the supernatural genre, The Testament of Sister New Devil is a high octane romp about a high school boy and his two succubi step-sisters, that will appeal to fans of manga series like High School DxD and Dragonar Academy.