Boin

When a new teacher lands a job at an all-female academy, gets assigned as job counselor, and somehow ends up doing role-play career exercises with his students — nurses, shrine maidens, the works — that's the entire premise of Boin, a two-episode OVA from 2005 based on a visual novel by Crossnet-Pie, and it leans into that setup with zero pretense about what it actually is. This is hentai, and it knows it. The tone stays light and comedic throughout, built around the playful back-and-forth between Daisuke and students like Nao and Mitsugu, who are both clearly interested in more than career guidance. The character designs are heavily exaggerated in the style typical of mid-2000s hentai visual novels, so if that era's aesthetic works for you, this fits right in. It's short, it's straightforward, and it has a consistent comedic energy rather than taking itself seriously. If you've watched Resort Boin and want something in a similar vein with a school setting instead of a vacation backdrop, this covers similar ground. Fans of Bible Black or Discipline: The Record of a Crusade who want something lighter and less plot-heavy might find this a more relaxed watch. At two episodes, there's no real buildup — it just drops you into the situation and runs with it. Exactly what it says on the box, nothing more.