In 2019, a murder case was discovered under a national highway viaduct in Shizuoka Prefecture. The police officer Kusakata Satoru of the Susono Police Station of the Shizuoka Prefectural Police, who was investigating the case, discovered that Sudo had divorced his wife in 1979 and his young son Mamoru Obata, who was living in Shizuoka at the time, died in an abduction and murder case. In 1974, a year before the statute of limitations for this case was established, a special investigation team was established under the instructions of Haru Yasuhide, the head of the Shizuoka Prefectural Police Headquarters. After that, Shigeto Seiichiro, who was promoted to the Metropolitan Police Department without a formal position, became the management officer and led six capable police officers to conduct another investigation.