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The Testament of Sister New Devil Vol 6 by Tetsuto Uesu. An Ecchi manga rated Older Teen, published in English by Seven Seas in 2017.
Basara Tojo's father remarries, and he gets two new stepsisters, Mio and Maria, who turn out to be demons. Mio is the daughter of the late Demon Lord, and Basara must protect her. A fan-service-heavy harem series.
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