Before she knew it, Kati had been reincarnated as a baby. While she is confused by her sudden reincarnation into another world, she is taken in by Edvard, a cool and talented young prime minister. She was happy to see her handsome dad, but it was revealed that she had memories of her previous life! Edvard, who learns Kati's secret, gives the baby some very tough training in order to be able to use Kati's knowledge and to protect Kati herself. As she continues her special training while thinking, "This devil!", Kati begins to work as Edvard's intelligence agent...!? She crawls at high speed and does intelligence work while being loved as a cute baby!