This drama is adapted from the manga by Yuuma Ki. It tells the story of Takahashi Satsuki, who has been in the company for 5 years and is ordered by her section chief to take care of the young and beautiful regular employee Anzai Ririka. However, she is completely unable to work, so Satsuki's business has only increased. One day, Satsuki discovered that Ririka and the section chief were lovers, but she had to work overtime because of Ririka, and finally could not keep her boyfriend's appointment, and could only swallow her tears. At this time, the simple temporary employee Rei Saegusa came over and said, "In-company cheating is a troublesome behavior that should be eliminated. If someone can break them up..." After leaving this meaningful words, she left. Rei Saegusa's "cleansing" has begun!