The Testament of Sister New Devil: Burst OVA

The Testament of Sister New Devil: Burst OVA is an original video anime bundled with the seventh volume of the Shinmai Maou no Testament manga, released in January 2016, accompanying Burst, the second season of the anime.

The story follows Basara Toujou, a high school student whose father suddenly brings home two new stepsisters, Mio and Maria Naruse. The girls turn out not to be human at all: Mio is the daughter of the previous Demon Lord, hunted by demons who want her inherited power, and Maria is a succubus who serves as her protector. Thanks to a master-servant contract that worked the opposite way from what the girls intended, Mio ends up bound to Basara, a former member of the Hero Clan who resolves to protect his new family.

The OVA offers an extra episode with Basara and the heroines around him, in the same mix of supernatural action and bold ecchi comedy that defines the series.