After clearing away the numerous murder mysteries, what is revealed is the only truth. When the facts are unearthed bit by bit, what is deduced turns out to be the human heart. Since ancient times, heroic men have been traumatized by their beauties, and whether women's tragedies can end abruptly. At the same time, what is growing wantonly in the sun is that innocent romantic relationship. In Kyoto's Jian'an City, homicides occurred frequently, so the highly respected detective became the one to resolve disputes and problems. They belonged to the aristocratic class and had close ties with the royal family. They were also deeply trusted by the common people and were the talents of the time. However, in people's minds, poison is a sinister and terrifying thing. Most poisonous masters have a tradition of passing it down from female to male. The women who inherited the poison technique were even more misunderstood by people. In the turbulent struggle for royal power, the ultimate showdown between the detective and Poison began.