Kanna, the sales manager at an office equipment sales company in Tokyo, is stressed by the excessive expectations of her company, her heavy workload, and the misunderstandings with her husband. She's also troubled by her relationship with her incompetent subordinate, Yoshino, but one day, she shows her weakness in front of Yoshino, who pins her down and reveals her masochistic nature. From then on, she's taken to an SM hotel during her lunch break, where her body is imprinted with pain and pleasure, and her subordinate trains her as a submissive bitch...