Maria doesn't pretend this birthday party is about anything other than getting Basara and Mio together, and the show doesn't pretend it's about anything other than that either. The lust spell setup collapses into pure chaos because every character just wants something different, and the OVA lets it stay stupid instead of trying to manufacture a plot. This is what self-aware ecchi looks like: no apologies, no fake narrative scaffolding, just creative absurdity in service of the thing you came for.
Basara's quiet day takes a turn when Maria, a mischievous succubus with romance on the brain, decides his adopted sister Mio deserves the perfect birthday celebration. Her idea of perfect involves a lust spell, matchmaking scheming, and absolutely zero regard for Basara's protests about maintaining their household peace. What follows is chaos wrapped in Maria's relentless determination to push Mio and Basara together, complete with magical interference and increasingly awkward situations. The succubus treats the whole affair like a personal project, convinced that some magical nudging is exactly what this uptight arrangement needs. It's the kind of OVA that leans hard into its ecchi roots while playing the situation for laughs. If you've been following the series, this captures the show's trademark blend of action-fantasy setup with comedic romance chaos. Maria steals the spotlight as the comedic force of nature, and watching her refuse to accept Basara's reasonable objections to her plan never gets old. Perfect for fans who enjoy their supernatural comedy with a heavy dose of fanservice and zero apologies about it.