Husband "Tomoyuki," his younger brother "Masayuki," and accomplished physician wife "Yumi" run a small hospital together. Normally, Masayuki works as an inept nurse while Yumi stands as the proud, capable doctor holding the hospital together. However, an incident sparks a twisted relationship between the two. By day, they are "the one who commands" and "the one commanded"; by night, "the one who binds" and "the one bound." Yumi discovers her hidden masochism, and her deviant desires gradually grow, causing her to forget her guilt toward her husband as she becomes addicted to tight bondage. Set within the hospital, this depicts a disturbing, mesmerizing, and abnormal relationship.