Hello Everyone. I don't have much to go on.
I believe this was in a highschool harem type story. I believe the main scene Im recalling took place in a lunch room.
The Male MC ends up talking with and or taking the "school slut", i think she was rumored to take money for sex, on a date and his friends group shuns him. He finds out not only is she not a slut but a good person.
In the end I think the friend group apologizes and "adopts" the girl.
Sorry its not much to go on, but its been in my head for a few days and I have not been able to get more details.