Called into a room, but no one is there—only a forgotten camera and an envelope marked with a number. A sudden encounter with a mysterious man leads to her first sexual experience. Shy Haruka is mercilessly tormented with sex toys, making her squirt for the first time uncontrollably. In her first threesome, she actively grinds her hips, chasing pleasure. Confused, she begins a solo shoot. An ultimate debut unfolds within the confines of this locked room.