This drama tells the story of a brother and sister whose father, Takashi, was killed while working as a policeman. Soon after, they learned that the prisoner was a cadre of Japan's largest special fraud organization, Phantom Beast%, and the two decided to avenge their father.His elder brother, Wataraze Kiichi, was a policeman and was full of justice and action. His younger sister, Wataraze Yuki, was an engineer at a national university and an excellent white hat hacker.The two used their respective specialties to infiltrate the organization and confront the evil.

Five years ago, his brother Wataraze Kiichi (Ryo Ryusei) was a police officer, and his high school student sister Wataraze Yuuki (Yagi Riko) won the runner-up in the White Hat Hacker Competition. She was supposed to celebrate with her father that night.However, his father Wataraze Takashi (Handa Shuhei) was killed by an unknown person.For brothers and sisters who lost their mother early in life, their father is an irreplaceable presence.In order to find out the reason why his father was killed and the motive of the murderer, and in order to restore happiness to Yugui who lost his smile after the incident, Guiyi used the “phoenix” tattoo engraved on the back of the murderer's hand as a clue to start tracing his true identity.

Five years later——.His brother Guiyi quit his job as a police officer, and his sister Yougui became a genius white hat hacker.The brother and sister tracked down an organization called Phantom Beast“ that committed various fraud crimes.The total amount involved in the case exceeds 12 billion yen.

In order to find out the true identity of the leader of the organization, ”Phoenix“, the brother and sister concealed their identities and sneaked into the ”Huan Beast“ organization.After becoming a member of the organization, they tried to get close to Phoenix.However, the brother and sister's actions were seen through by the cadre Xuanwu, who suspected that they were the lackeys of the Japanese side.Kiichi and Yuki's identities are suddenly exposed and they are in a desperate situation——!!

In order to avenge his father's murder, Kiichi tracked down the ”phantom “ leader ”Phoenix“, and was selected as a infiltration investigator by Kanagawa Prefectural Police Sayaka Hayakawa (Nagao Junko) who also aimed to destroy ”phantom“.In fact, my father, Guiji, also infiltrated the ”Eidolon“ organization as a infiltration investigator, but his identity was exposed and killed on the way.Although he was angry at the police officer who refused to save him, Guiyi was determined to inherit his father's legacy. In order to fulfill his father's wish, he applied for a infiltration investigator alone.

However, Yuuki's figure appeared at the work site.”I also want to join“.Yougui also predicted Guiyi's actions and came to apply.The matter has come to this, there is no turning back——.The brother and sister passed the recruitment test set by team leader Minami (Anna Iriyama) and finally successfully infiltrated ”Eidolon%.However, the ruthless Xuanwu immediately doubted them, and the brother and sister were in a desperate situation——!!