Futa-bu!

Bored with the monotony of high school life, Akane Niimura decides to fix that by joining the most unusual club on campus — the Futa Club, an all-futanari organization whose members spend their free time in very adult ways. The catch: Akane is a regular girl, which means she can't be a full member. Instead, she gets slotted into the role of 'service specialist,' which is exactly as subservient as it sounds. The two-episode OVA from Studio 9 Maiami is adapted from the manga and leans fully into its niche premise without much apology. It's short, it's explicit, and it knows exactly what it is — a hentai built around a school club setup that gives the whole thing a slightly comedic, almost slice-of-life framing before it gets into the actual content. The club dynamic and Akane's outsider-trying-to-fit-in situation give it a thin but functional narrative thread that distinguishes it from purely plotless entries in the genre. If you've already seen Futa-bu!! or Futa-bu! Mix: Futanari World, this is essentially where that world started, so it's worth going back to the beginning. If futanari content is something you're curious about and want an entry point that at least has a recognizable setting and a central character to follow, this two-episode run covers the basics without overstaying its welcome.