Her husband is also a hardworking man, and her stock investments, which she started as a hobby, are going well. Two thugs sneak into Yumi's happy life. Yumi is tied up and raped. They are her husband's younger brothers. Oki, who witnesses the scene by chance, is captivated by the rope digging into Yumi's body. Oki, using his secret as a shield, "bonds" Yumi. Yumi begins to find pleasure in being tied up and raped...