Professor Pain

From the very start, Professor Ohse puts students at Aoi College on edge. There's something off about him — a little too intense, a little too interested. Turns out their instincts were right, because the man is not just a creep with tenure. He's a full-blown terrorist who locks down the entire campus and turns it into his personal domain of control and cruelty. The female students, all adults at 19, have nowhere to run. What follows is a dark, psychologically heavy two-episode OVA from 1998 that leans hard into themes of power abuse and manipulation. The late 90s Artland animation gives it that specific grainy, high-contrast aesthetic that era was known for, which adds to the suffocating atmosphere rather than taking away from it. This is not a lighthearted watch — the tone is bleak and the content is deliberately uncomfortable. If you've already gone through similar titles like Nightmare Campus or Gedou Gakuen and you're looking for something in that same vein with a more contained, thriller-adjacent setup, this fits that mood. It's based on a visual novel, so the character framing has a bit more structure than you might expect from a random hentai OVA. Just go in knowing exactly what kind of story this is. It does not soften its edges.