Reconstruction story ~ If you forgive her who cheated ~

Her cheating on the cosplayers was discovered.
Although the protagonist is severely depressed, he chooses to rebuild (start over) with his beloved girlfriend.
Despite suffering from flashbacks of an affair, she was beginning to regain her happy days.

But one day, a certain erotic video began to be sold on the Internet, and it became a topic in some neighborhoods.
It was a gonzo video of her cheating.