Classmates Aya and Yume are happily chatting while eating snacks together in a room. Mischievous Aya playfully teases Yume's inner thighs with her feet, finding Yume's reactions incredibly amusing. Curious about what would happen, Aya becomes fascinated with the idea of using an electric massager and secretly applies it to Yume under the table. Yume begins reacting in an erotic way, making Aya excited and eager to use the massager again. Although Yume resists slightly by closing her legs, she eventually gives in and allows Aya to continue. As Yume starts moaning uncontrollably, Aya gets carried away, relentlessly using the massager until she makes Yume climax. Afterward, Yume retaliates by turning the tables and applying the electric massager to Aya, bringing her to climax as well. The two then begin a back-and-forth game, pressing their legs against each other's crotches and taking turns with the massager. Discovering the unexpected pleasure of electric stimulation between girls, they grow curious about how a man would react. They call over Aya's childhood friend and together mercilessly assault him with the electric massager, making him climax repeatedly. The main feature includes facial exposure.