(Note: Move the mouse over the text below to open the summaries of each Season, OVA, or Movie that is listed.)
~§~ The Testament Of Sister New Devil ~§~
Basara Tojo is a student at Hijirigasaka Academy, his father, Jin, had just remarried. Basara then meets his two sisters, Mio Naruse and Maria Naruse. His father goes and departs overseas and Barsara finds out that his two sisters are actually part of the demon clan, and he is meant to be with the hero clan. Mio happens to be the future Demon Lord since her powers hasn’t awakened yet. Basara accidently forms a reverse contract and ends up being Mio’s master. Barsara will now protect Mio from any demon that tries to get Mio’s power that she had inherited from her dead father, Demon Lord Wilbert.
~§~ The Testament Of Sister New Devil BURST ~§~
Mio had received a summons to return to the demon relm, everyone goes along with her knowing what danger they could be in. While in the demon relm, Basara must grow stronger when Rukia, Maria’s sister suddenly appears. Basara must prepare for the biggest war yet in the demon relm that can impact their future.