The Testament of Sister New Devil BURST: Tojo Basara’s Perfectly Peaceful Daily Life Shinmai Maou no Testament: BURST - Toujou Basara no Shigoku Heiwa na Nichijou English Subbed

An OVA that was bundled with the seventh volume of the Shinmai Maou no Testament manga.

What’s the best way to celebrate a birthday? Well, to the succubus Maria, there’s only one thing to do—get Mio and Basara to hook up! Using the guise of Mio’s birthday, and a lust spell, she’s determined to have the perfect setup for a sexy celebration.

(Source: Funimation)