Minor spoilers ahead :
Based on previous OVAs materials , this OVA plays with the audiences expectations and works effectively to deprive the audience of sexual fanservice in a hilarious way. Assassin install Shinji Matoi is the central character throughout, with Kuro and Illya only appearing in the final 10 minutes or so. It deals with his trials and tribulations, constantly being the butt end of jokes. The most fanservice in the film is of Luvias butler washing Shinjis back in the shower and a gross gender swapped Julian shower scene. The writers definitely thought of how to troll viewers fan service expectations and it played out perfectly.
The OVA, however, is rife with series fanservice character moments like Carnival Phantasm. Every character that has ever appeared in the Prisma series makes at least a cameo, with Shinji and Kirei receiving significant spotlight. Like Carnival Phantasm, the jokes hit hard and the character writing is great. Obviously, a working knowledge of the Prisma verse is nessecary to get all the references, but this OVA is obviously meant for the already initiated.
The final after credits scene even teases the continuation of the main line series. Which is definitely exciting.
