Blue Blood Cell and Dragon Fangs Sakurai finds Kumade's blood on the T. Rex and reveals Kumade was a gang member. His body was discovered by construction workers who sought help from Dr. Hachisuka at a nearby clinic. Takao deduces Kumade was responsible for a shooting in Nerima City and Sakurai confirms Kumade shot a Yakuza boss and is believed to have been killed in revenge, risking a gang war. Takao finds more blue blood at the museum and deduces Hachisuka is the culprit and has Sakurai apprehend him when he breaks into the museum. Takao explains to Sakurai that Kumade must have been shot in the leg trying to escape the Yakuza, so he sought medical attention at Hachisuka's clinic. Unfortunately, Hachisuka accidentally overdosed Kumade on anesthetic, causing oxygen deprivation and turning his blood blue. Panicking, he took Kumade to the museum to treat him with Methylene Blue, a drug used to treat tropical fish that also reverses oxygen deprivation. When Kumade died anyway Hachisuka tried to hide the evidence he treated him by using the T-Rex head to sever Kumade's wounded leg and dumped his body at the construction site. Hachisuka then tried to break into the museum to remove the Methylene Blue bottle that has his fingerprints on it. Angered, Hachisuka tries to attack Takao but is knocked out by Yu. Takao and Yu return to her home, but find Takao's older sister Mazuru waiting to scold Takao for neglecting her job and continuing her unhealthy lifestyle.

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