The entire joke is that Asuka has no idea what she's doing, and the show trusts you to find the gap between her innocence and everyone else's panic. Every episode is two minutes of perfect timing, a voice actress who makes obliviousness feel like a real person, and a setup that lands the same way each time without getting tired. It's ecchi that doesn't need a story to work, just a girl in a room and five seconds to watch the world misinterpret her.
Asuka breezes through high school completely unaware that her innocent actions constantly put her at the center of hilariously uncomfortable situations. Without meaning anything by it, she keeps doing things that the men around her read as sexually suggestive. The comedy lands in that gap between her genuine cluelessness and everyone else's flustered reactions. Each episode presents a new awkward scenario built on her obliviousness. Across 20 ONA episodes, the humor mixes ecchi innuendo with the running joke of watching her accidentally drive people crazy without a clue what's happening. It's light, silly fun that doesn't pretend to be anything more than what's on the surface.