Boku to Kanojo no Gattai Kinenbi

A nervous couple prepares for their first sexual experience together. The boyfriend is especially anxious, but the sight of his girlfriend's large breasts instantly boosts his confidence and motivation. They engage in foreplay, including various intimate acts, as they try to navigate their shared nervousness.

Just as they are about to proceed to intercourse, they realize they have forgotten to buy condoms. This unexpected discovery throws their plans into disarray, leaving them to figure out how to handle their first time without proper protection. The couple must decide what to do next.