Mesu Kyoushi 4: Kegasareta Kyoudan

Kaho, Maki, and Miyu, three female teachers at a Japanese high school, each find themselves caught up in situations that blur the lines between their professional authority and the power dynamics lurking underneath. What starts as fairly standard school drama quickly shifts into something far more provocative, as the series peels back the composed exterior these women maintain and digs into the tensions that simmer beneath the surface. This is a 6-episode OVA from 2015, produced by PoRO and adapted from the Bishop erotic visual novel of the same name. If you're familiar with Bishop's catalog, you already know the tone, it leans heavily into themes of control, temptation, and compromised boundaries within institutional settings. The animation quality is solid for what it is; PoRO generally delivers clean character designs and consistent production across their catalog. If you've watched Mesu Kyoushi: Injoku no Kyoushitsu and want more from that same universe and premise, this is the direct continuation of that thread. Fans of Kansen: Inyoku no Rensa or Shoujo Senki Soul Eater will find a similar approach to its mature content: gradual escalation with multiple female leads each getting their own storylines. Fair warning: this is straight-up hentai, no ambiguity about it. The genre tags aren't hiding anything. But within that lane, it's a well-produced entry with distinct characters and a visual novel source that gives it more narrative structure than you might expect.