This OVA epilogue basically acts as a fast recapitulation for the first episodes from the series. The main plot involves a horde of zombies attacking Hime's Mansion in order to feast on her blood and acquire true immortality, which by now it may sound old (depending if you saw the series or not) but the hook here is that this revision is far more obscure, gory and sexualized than the series. I'm implying that the producers here wanted something in a similar fashion as Hellsing Ultimate with more closeness to the mangaka original vision of the history, so you better expect tons of panties accompanied by frenzied zombie annihilations.
Its a shame that this would last just another episode, though it kinda looked like a fair doses of monster killing and sexual innuendos just enough to make you wanna see more, but at least that means less milking for the actual buyers of the DVD's.
That summarizes my whole perception of this OVA, either you liked the series or not, give it a watch.
