Unsweet: Netorare Ochita Onna-tachi

When a student and his teacher enter into a secret romance, it's already a powder keg of a situation before anything even goes wrong. Jun and Katsuko Kurose have built something real between them, hidden from the world inside classroom walls. Then another student, Kazuya Shinohara, stumbles onto their secret — and decides to use it. What follows is a tense, uncomfortable story about power, vulnerability, and what happens when someone gets leverage over a person who has everything to lose. Katsuko is caught between protecting what she has with Jun and the escalating demands of someone who holds her reputation hostage. The drama leans hard into emotional manipulation and the psychological weight of being cornered with no clean way out. Don't expect resolution that feels good — this is the kind of story that sits with you in an uncomfortable way, which is kind of the point. If you've watched something like Kuroinu or Euphoria and appreciated how those push into dark emotional territory rather than staying surface-level, this hits a similar nerve. It's a single OVA from 2012, adapted from manga, so it's compact and self-contained. The school setting grounds it in something recognizable before pulling the floor out. It's not for everyone, and it's genuinely not trying to be — but if you're drawn to stories that explore messy human dynamics without flinching, this one delivers exactly what it's going for.