I found a raw amateur AV on the internet and it turned out to be my beloved fiancee. Miru

The movie revolves around a couple, Miru and Kenta, who are engaged to be married. However, their relationship is put to the test when the protagonist discovers a sex video online featuring someone who resembles his fiancee. As the story unfolds, it becomes clear that the couple's relationship is built on trust, intimacy, and a deep emotional connection. The central dramatic tension arises from the protagonist's struggle to reconcile his love for Miru with the shocking discovery he has made, which threatens to upend their entire relationship.