The show knows exactly what beach episode trope it's walking into and systematically mocks every beat before the fanservice can land. Kugimiya Rie's deadpan delivery turns Nagi's self-consciousness into the actual punchline instead of the setup. It's reference-heavy comedy that trusts you've seen enough anime to laugh at the framework itself, not just the gags, which is exactly why Hayate fans showed up in the first place.

Maria wants Nagi to swim and enjoy the summer, so she invites a group of friends to the Sanzenin family's private beach, which sits within the family's huge estate. The others are soon having a good time, but Nagi is embarrassed about her small chest and balks at putting on a swimsuit, refusing to come out and join them. Just as she is ready to take part after all, a spirit bent on revenge shows up to spoil the day. The single OVA episode mixes comedy, romance and action.