I'm not adding the animated tag to this, I think that would be a stretch.

Released date : 2026-09-10

One day after school, when you return to the classroom to pick up something you forgot, you happen to witness the true face of your classmate, Hana Miyabi. In exchange for ‘a good time,’ she promises to keep your secret, and you end up having to teach her everything—from studying to naughty things.

https://www.dlsite.com/maniax/work/=/product_id/RJ01653668.html