[Machine Translation] A serial arson case and a serial murder case occurred simultaneously in the jurisdiction of the three precincts, Wangan, Omori, and Oi! Officer Ryoma Tsukigata Ryoma, who works at the Wangan Police Station, is sent to the investigation headquarters to protect them, and decides to have a battle of mourning. Kenichi, a classmate from the police academy and the brother of his girlfriend, Mio Nakajima, has been murdered. His partner is Hideo Hyuga, a lieutenant in the Metropolitan Police Department and his father, who suddenly interrupts the meeting. His mother, Akiko Tsukigata, an elite career police inspector, who is well-connected with the upper echelons of the police department, apparently sent him. It seems that her ex-husband was sent to be her son's mentor. Father and son detectives Ryoma and Eisei work together to solve the two cases. The first in a series of out-of-the-ordinary police novels!