Takumi is a sullen and eccentric investigator with a love for murder and killing. He finds solace in hiding in dark spaces and is known for his laziness, often relying on his partner, Misaki, for work. Despite this, Takumi possesses strong observation skills and is easily infatuated, leading to a loss of composure. He is fascinated by murderers, rating their crimes and even emulating them. Takumi lacks morality and feels disdain for those who lack regard for human life.