Tomoka, who was forced to leave home and marry during her school days, is invited to her husband's family home for the first time in five years, where she reunites with her father-in-law, Masahiro. Coming from a prestigious family, Masahiro had strongly opposed Tomoka's marriage and plots to convince her to break it off. When Tomoka firmly refuses, Masahiro binds her tightly with rope from behind and locks her in a room. As she endures the physical pain and succumbs to her father-in-law's intense pleasure, Tomoka's heart and body gradually drift away from her husband. This work deeply portrays her emotional turmoil and physical transformation.