A man secretly infiltrates an office building in Tokyo and approaches a middle-aged female worker during her shift. Burdened by daily job fatigue and a cold relationship with her husband, she secretly craves excitement. As the man boldly exposes himself and acts lewdly right in front of her over her uniform, she feels embarrassed yet unconsciously awakens to her feminine instincts. With tension building in the confined space and limited time, the man's sexually harassing presence grows stronger. Will she ultimately give in and allow full intercourse? The climax holds the answer.