After joining the company where her father works, Yui enjoys a promising career and is well liked by her senior coworkers. Company president Sugiura takes an interest in her, appoints her as his secretary, and begins making sexual demands. When she resists, he threatens her father's position. Unable to endanger the man who raised her alone after her mother's death, Yui is forced into submission while desperately fearing that her father will discover what is happening.