Girls whose nipples are always sensitive and erect spend their days in restless longing, craving to be touched. All it takes is one spark for a new experience to begin. When they meet as classmates for a sleepover at the hospital ward, they are drawn into a situation filled with fresh excitement. In various scenarios, their exposed nipples are tormented with erotic devices, and when those hypersensitive parts are licked, the sensation becomes unbearable. Their passion and desire give rise to a single, intense story.