This is an odd spin on netorare, it's retroactive feelings of loss.
Close friends are hanging around playing games, he then bluntly asks her to be his girlfriend since they have been tight for a while; she rebukes him by asking if he can accept a loose slutty girl like her, she has had a long list of men on the past and has partake in all sorts of kinks, considering herself to be used goods, thus she gets oddly creative and purposes a bingo to lay down all of her past experiences and duke it out with him through several short sessions, in separate days, to see if he still wants to be with her after going through all of her recollections. He accepts, despairing through hearing her account of past events.