Betsu ni Anta no Tame ni Ookiku Natta n ja Nai n Dakara ne!!

Bred to be a proper lady and raised in wealth, Kaoru Okisada attends a high-society party and comes home with a very specific homework assignment — she overheard terms she doesn't understand, and as a proper lady, she feels obligated to educate herself. Her solution: ask her new butler to explain things hands-on. That's the entire setup, and it commits to that premise with a surprisingly light, comedic touch before things get explicit. This is a single-episode OVA from Studio Boogie Nights, and it leans into a familiar tsundere-adjacent dynamic — Kaoru is haughty and embarrassed in equal measure, which gives the whole thing a flustered, almost farcical energy before it stops being coy about what it actually is. The high-society mansion setting adds a layer of absurdity that keeps the tone from feeling too heavy. It's not trying to be deep; it's a short, breezy adult title that uses its premise for comedic contrast as much as anything else. If you've watched something like Aneki... My Sweet Elder Sister The Animation or Oni Chichi and appreciated when these titles have at least some personality behind the setup rather than skipping straight to the point, this scratches that itch. It's also tonally adjacent to I Don't Like You at All, Big Brother!! in how it plays embarrassment and curiosity for laughs. Short runtime, clear premise, does what it advertises.