After her husband's failed investment leaves her with five million yen in debt, Yuri Ikuta cannot bring herself to tell him and instead turns to her father-in-law for help. He agrees to pay off the debt, but in return demands complete control over her body. With her weakness exposed, Yuri is forced to submit to his every desire, becoming nothing more than a sex slave and cumdump for her father-in-law. As their illicit relationship deepens, Yuri finds herself mentally and emotionally cornered, unable to resist his escalating demands. The tension builds as her father-in-law's lust invades every gap in her daily life, intertwining with her growing anguish in a heart-pounding, suffocating drama.