After her husband went on a business trip alone, Miki had been living with just her son for a long time. She was originally more sexually driven than most people and had been releasing and suppressing herself through masturbation. However, driven mad by the allure that seeped out from her repression, her son Junpei could no longer hold back and pushed her down, crossing the boundary of their mother-son relationship. Since then, Miki has been living in days filled with hidden lust, but her brother-in-law Tatsuaki finds out. Enraged, Tatsuaki says, 'I'll give you your punishment!' and begins to shave the pubic hair growing on Miki's crotch.
