A young woman named Kokoro finds herself struggling after her father disappears, leaving behind unpaid debts and rent arrears. Desperate to help her sick mother, she pleads with their landlord, who uses a wheelchair due to illness. Initially, he agrees to assist her but soon begins taking advantage of his position by repeatedly engaging in sexual harassment. As time passes, his demands escalate until they reach the point where he forces her into anal sex. Despite initially resisting, Kokoro eventually succumbs to her situation and becomes his sex slave.

父が失踪して借金や家賃を滞納してしまい、無理して働き病気になった母の代わりに大家のヘルパーを懇願する娘のこころ。車椅子生活で不自由している大家「なんでもしますから」とこころが頼み込んできたことをいいことにセクハラ行為を繰り返す。最初は介護だけだったが要求はとどんどんエスカレート、ついに中出しセックスまでされてしまう。最初は抵抗を見せていたこころだったが次第に性奴と化していくのだった。