Shiori works as a clumsy office cleaner, going about her daily routine until one day she's caught using the men's restroom and gets caught up in trouble. To keep her secret, she's forced into sexual servitude—giving a vacuum blowjob and receiving an internal cumshot. Someone secretly records the act, and soon another employee starts pressuring her too. In the restroom, she repeatedly masturbates, filling the space with lewd sounds. Later, in a dark storage room, she engages in titfuck, 69, and full-penetration creampie sex. By accident, she throws away an important document, leading her boss to punish her with big ass spanking, standing doggy style, and hard cowgirl position pounding. Each time, she pleads "Sumimasen!" ("Sorry!") while drowning in pleasure. Amid unexpected troubles and forced encounters, Shiori rapidly blossoms with mature allure.