Animation:
The animation quality is on par with DxD New, which is to say it's already slightly dated. Lines are a bit blurry and everything is more or less drawn rather than generated. The characters are drawn identically to the parent show and, really, the only difference is the amount of fan-service based ecchi. This pretty much borders on suggestive hentai.
Sound:
The OVA uses the 2nd OP and ED from DxD New and the BGM, like the parent show, is completely forgettable. They pack a lot of characters into this OVA so expect a majority of the main VA cast to be present in this episode.
Story:
I pretty much summed it up in the introduction. The story isn't particularly great nor does it add anything to the franchise. The plot here is self-contained with fair rising action, climax, and resolution; but honestly, it's not to be taken seriously as the main focus is to shove breasts in your face.
Character:
Though we got many cameos here, there isn't any particular development per say, just a lot of different characters screaming as they are fondled, unclothed, or otherwise molested. I had forgotten how much of an open pervert Issei is.
Value:
Honestly speaking, this OVA perhaps has some entertainment value but otherwise adds very little to the franchise. Unless you find yourself in a desperate need of either DxD or something extremely ecchi yet not hentai, this is probably skippable.
