The Boundary of Immorality: The Ura Side ♥ of the Female Teacher

Cold, composed, and strict enough that nobody dares step out of line in her classroom, Miyuki Kisaragi is the kind of teacher students keep their distance from. But rumors have a way of spreading in high school hallways, and the whispers about her private life paint a very different picture than the one she projects at the front of the room. That gap between who she appears to be and who she might actually be is where this two-episode OVA from studio Nur plants its story. The setup leans into that tension between public persona and private reality, pulling in a small cast of characters — Kurumi Sakashiro, Sara Yasui, and Itsuki Miwa among them — who each connect to Miyuki in ways that chip away at her carefully maintained image. It's a short watch, so don't expect a sprawling narrative, but the compact format means it moves quickly and doesn't overstay its welcome. If you've seen Haitoku no Shoujyo - Family of Debauchery or Desire: Haitoku no Rasen and liked how those handled the contrast between respectable appearances and what goes on behind closed doors, this sits in similar territory. It's also comparable to Hyakki - The Secret of Devil's Island in how it uses an institutional setting to frame its mature content. The drama element is light but present, and there's enough character framing to give the story some texture beyond just its explicit content.