The Testament of Sister New Devil: Burst

Basara Toujou's life is complicated by his role as protector to his step-sisters, Mio and Maria Naruse, who are both demonic. The girls' power makes them a target for entitled demons, and Basara must also navigate the rising tensions within the demon realm. When a messenger summons Mio to the demon realm, she and her friends decide to accompany her, despite the risks. There, Basara will need to develop his abilities to safeguard those around him.