The HOTD crew on a beach is the entire pitch, and the OVA commits to it completely, no pretense of plot, just beautiful character animation and the kind of fanservice that knows exactly what it is. The island setup dissolves within minutes because there's no reason to pretend this is zombie fiction; what you're actually watching is character art so detailed it feels like visual novel frames come to life. If you came for the horror premise, you're in the wrong place. If you came to watch Saeko and Rei drawn at this quality level with this much attention, everything else falls away.
A reprieve from the constant threat of undead horrors finally arrives when Takashi and his ragged group of survivors wash ashore on an isolated island. With zombie attacks momentarily behind them, the exhausted band decides to actually enjoy themselves for once, stripping down and soaking in the island's deceptively serene beaches. They discover an abandoned store and begin settling in, ready to decompress after weeks of pure survival mode. But this temporary paradise hides something darker than shambling corpses. The island's ecosystem harbors its own deadly secrets, and as the group relaxes their guard and lowers their defenses, something unexpected crawls out from beneath the sand. What emerges turns the relaxing getaway into a comedic nightmare that nobody saw coming, proving that sometimes nature's threats are far stranger than the supernatural ones they've grown accustomed to fighting. It's a high-octane breather episode that balances crude humor with genuine tension, offering fans of the franchise exactly what they came for: bikinis, chaos, and the kind of ridiculous disaster that somehow makes sense in a world already overrun by the dead.