We could definitely do with some more Highschool of the Dead if you ask me, especially with the series proper left hanging, so does this OVA fit the bill of giving us another zombie killing fix?
Err.... no. This additional episode, subtitled Drifters of the Dead, sees the gang finding their way to a small, uninhabited island somewhere in their attempts to escape the zombie hordes. This, of course, can mean only one thing - a beach episode. Lo and behold, it takes no time at all before the entire cast (including its male number) are decked out in swimsuits.
After all of the usual splashing around in the water, an attempt to collect and cook food goes horribly wrong, with the hydrangea leaves unwittingly used to cook the food causing hallucinations for all concerned. Although I'm not sure this is technically accurate (yes, it is a poisonous plant but I'm not sure about it causing these symptoms), that's of little concern, as you can probably see where the episode is headed next, with each character "indulging" in their own delusions for the titillation and entertainment of the viewer.
While some OVAs are well worth taking some time out to watch, I can't really pretend that this additional episode of Highschool of the Dead is one of them - its animation budget concerns itself only with bouncing female flesh with little time taken on anything else, and any semblance of a plot is cheesy, nonsensical and outright ridiculous. If you only watch this series for the fan service then this is probably some kind of gift from the heavens for you, but if you're more interest in the way it blends those elements with slick, jaw-dropping action then there's nothing to be gained from watching this bonus instalment.