Shizuka lives with her husband and son. She thinks she's happy, but she's also unhappy. In the past few years, her nighttime activities have decreased significantly, and Shizuka has been distracting her dissatisfaction with her masturbating while taking a bath. One day, her son looks into her. The sight of him rubbing her breasts violently and dripping lewd juice while sobbing was a sight that was more than enough to transform her son's "kind mother" into an "adult woman".
