A woman who runs a caregiving service company with her husband receives a new client request. The client is a man named Saito Osamu. Her father was once the boss of the yakuza group Sakaguchi-gumi, but was murdered by Saito, who at the time led the rival Saito-gumi. The events of that day remain etched in her memory, and she resolves to approach him for revenge. However, when he appears, he is not the vicious criminal she imagined, but a gentle and frail elderly man. Though she conceals her true intentions, her heart begins to waver as her feelings slowly shift.