An ordinary housewife, Misaki. One day, I found out that my preparatory son, Yoshio, was masturbating in my underwear, and when I searched for a solution on the net, I arrived at an adult toy site. Misaki buys out of curiosity and indulges in masturbation. Eventually, it will be unsatisfactory and will seduce the cleaning shop's order. Yoshio was ignoring Misaki, who is drowning in such sexual desire. And the envy and libido explode, and finally the forbidden door is opened.