Nagumo Rin, who works as an intelligence agent for the Ui country, infiltrates the Minase family, the head of the enemy country, Uen, to gather information. There, he meets Shizuku, a girl who has been seriously ill and has only a short time left to live. He feels a little irritated and dazzled by her, who is the complete opposite of him, who has been getting his hands dirty for the sake of his mission, but he gradually becomes attracted to her warm feelings for the first time and her way of living her life to the fullest...