Tominaga is a public investigator, now investigating a big-name female politician Koshimura Miyabi, the Minister of Health, Labour, and Welfare on allegations of receiving bribes. Koshimura is highly regarded to be on the path to become Japan's first female prime minister and known as a driving force to push forward reforms in social welfare. Tominaga then sets out to investigate the case while faced with various obstacles in the complicated world of national politics. ~~ Based on the novel titled "Hyouteki" by Mayama Jin.