yuuka niizuma, a married woman working as a librarian. ozawa, the president of a certain company who had been going to that library for some time, was attracted to yuuka's hidden charm, who wears glasses and behaves modestly. one day, yuuka came to ozawa's company for an interview. the reason why yuuka, who has no experience, applied was her husband's infidelity. from there, in order to escape reality... ozawa, who saw through that, proposes to hire her as a mistress secretary, taking advantage of this rare opportunity. in order not to let the hesitant yuuka escape, ozawa takes her lips with a lustful tongue as if it were a sex organ on the spot...