College couple Asuka and Sayu. After one year together, Sayu begins feeling their relationship has grown stale. Asuka is pure, cheerful, and popular, but no matter what sexual acts they try, Sayu remains unsatisfied. One day, he starts fantasizing: "What if Asuka were taken by another man... what would happen?" A few days later, Sayu finally confesses these feelings to Asuka. But shortly after, a video suddenly arrives on Sayu's phone from Asuka—showing her being violated by a lewd older man...