The Erotic Adventures Of Tom Thumb

Overworked, malnourished, and flat broke, a college student collapses and wakes up the size of a thumb. That's the setup for Issunboushi, a 2-episode OVA from 2007 that riffs on the classic Japanese folktale of the same name and wraps it in adult content. Tomo Issunbashi is just trying to survive student life when an ancestor from the afterlife decides to "help" him by shrinking him down to a fraction of his normal size. Whether that counts as help is debatable. Now tiny and completely at the mercy of the women around him, Tomo has basically zero agency — which is kind of the whole point. The size contrast is front and center, and the OVA leans into the absurdity of the premise while keeping things consistently adult. The tone bounces between light comedy and erotic scenarios, which gives it a personality that feels a bit different from more straightforward hentai. There's an actual folkloric concept underneath it, and the character dynamics have a playful quality to them rather than being purely mechanical. If you've watched something like Tsunpuri or Elf Princess Rane and appreciated when adult anime bothers to have a premise, this scratches a similar itch. It's not trying to be profound — it's a short, themed fantasy OVA that knows what it is and commits to the bit.