Two seemingly innocent, busty graduates, including the inexperienced Yuzuki, find themselves in a cramped tent during a camping trip. As they share stories, Yuzuki admits her lack of sexual experience, sparking curiosity in her friend. A sudden kiss ignites a fiery passion, leading to their first lesbian encounter. They explore each other's bodies, their curiosity turning into intense pleasure as they engage in their first-ever threesome, with Yuzuki's initial hesitation melting away in the heat of the moment.