Office lady Shizuko from the accounting department has been appointed as a mentor for new employees this year, diligently teaching a male newcomer the basics of accounting. While she maintains a strict demeanor when instructing the inexperienced rookie—sometimes lashing out with harsh words when emotions run high—she reveals her hidden seductive side during private after-hours sessions in the office. In these intimate moments alone together, Shizuko warmly supports the young employee. Through her unique blend of temptation and discipline, the once-inept newcomer gradually grows more confident, eventually maturing into a capable, full-fledged company man.