Nao Kiritani works as a visiting caregiver, assigned to an elderly man named Hiramura who appears frail but is actually faking illness to receive care services. In reality, he is perfectly healthy and only pretending to be sick for his own amusement. This deceitful man habitually sexually harasses his own wife, engaging in blatant infidelity without arousing suspicion from those around him. As Nao becomes entangled in his twisted world, the story unfolds into a complex human drama filled with lust, betrayal, and forbidden desires, culminating in intense creampie encounters between Nao and the manipulative old man.