An OVA that was bundled with the seventh volume of the <i>Shinmai Maou no Testament</i> manga.<br> <br> 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.<br> <br> (Source: Funimation)