Mei, the younger sister, had been tormented every day by the sounds of porn leaking from her brother's room. Her uncomfortable routine takes a turn when she reunites with her childhood friend, Mamoru. Struck by the grown-up woman Mei has become, Mamoru begins drawing closer to her, sparked by the sounds coming from her brother's room. Stimulated by the porn audio, Mei burns with passion during her first experience with Mamoru, her body trembling intensely. Their relationship evolves as sound and desire intertwine, heading toward a new beginning.