When the mother (Ichika) feels the need to urinate, she rushes to the bathroom, but her son (Shinichi) is there, so she has no choice but to hide in front of the storeroom to relieve herself. Shinichi sees her and blackmails her, but her resistance is futile as he takes her body. One day, something strange happens to Ichika's body after Shinichi gives her a sniff of a drug. Her body becomes hot and her private parts tingle, and she can't bear it any longer, so she masturbates next to her sleeping husband. Shinichi, who is watching this, uses the drug as bait and plays with Ichika's body, and Ichika's body also becomes useless without the drug...