One day, Aki Kamiya is informed that her son Ataru was caught committing indecent acts at school. Confronted by his friends Shota and Yoji, the honest Ataru begins to reveal the truth—until Aki, desperate to protect her son, pleads, "I'll do anything." Yielding to Shota and Yoji's demands, she's forced to expose herself in increasingly degrading ways. Witnessing this, Ataru is overwhelmed by uncontrollable desire, pins his mother down, and puts on her damp underwear. This entire incident was actually part of a scheme orchestrated by mischievous classmates targeting Ataru. Afterward, Aki is sequentially taken by her son's friends, repeatedly filled with creampie after creampie.