To save her family's legacy and protect her younger sister, Yakumo Rio enters into a desperate agreement with the predatory Innami Kouzou. With her grandfather ill and the Yakumo Group facing a hostile takeover by the Mitsuru Group, Rio sacrifices her dignity and body to Innami in exchange for his political influence. Forced into a series of degrading acts, Rio endures immense suffering to ensure her family's survival.
Rio's torment continues under the Innami group, but the situation escalates when her younger sister, Miyu, attempts to help and is manipulated into becoming a scapegoat. Forced into a cycle of shared abuse, Rio submits further to her captors in a desperate attempt to protect Miyu. Ultimately, the Yagumo group falls completely under the control of the Innami group, leaving both sisters trapped in a nightmare of total subjugation.