Fella Pure: Mitarashi-san Chi no Jijou The Animation

On the surface, Keiko Mitarai has everything figured out — student council president, respected by peers, basically the model student. Underneath that polished exterior, though, she's completely consumed by one very specific obsession that has nothing to do with student governance. When her parents leave the house, her younger brother Noburu becomes part of her private experiments in indulging that obsession, and things between them gradually drift further than they probably should. The dynamic between them is the core of the whole thing — this push and pull between her composed public persona and the chaos she lets loose behind closed doors. It's a single OVA episode from 2014 by Office TakeOut, adapted from a manga, so you're not committing to anything long. The animation is clean and the character work is more specific than you'd expect from something in this genre — Keiko actually has a defined personality beyond just being a plot device. If you've watched something like Oni Chichi or Aneki... My Sweet Elder Sister The Animation and wanted something with a slightly more character-driven framing, this scratches that itch. The tone mixes dry humor with the explicit content in a way that keeps it from feeling completely mechanical. Just go in knowing what it is — this is hentai, the incest angle is the whole premise, and it doesn't pretend otherwise.