Hiroaki Hidaka was born on April 17, 1962, in Miyazaki Prefecture, Japan. He was an excellent student during his early years. Hiroaki aimed to study at the University of Tsukuba but was not accepted. Instead, he enrolled at Fukuoka University, although he eventually dropped out. After leaving school, Hiroaki faced some difficulties. He often borrowed money and struggled with alcohol. He also visited prostitutes.

In April 1989, Hiroaki moved to Hiroshima. Once there, he started working as a taxi driver. In 1991, he got married, and two years later, he became a father when his daughter was born. However, his family life was troubled. His wife entered a mental hospital, which added more complexity to his life.

Hiroaki Hidaka killed and robbed four women between April and September 1996. His victims included a 16-year-old girl. Each murder was part of his pattern of crime during this time.

Hidaka was arrested on September 21, 1996. After his arrest, he faced trial for his crimes. On February 9, 2000, a district court in Hiroshima found him guilty and sentenced him to death. He did not appeal this sentence.

Hidaka was executed by hanging on December 25, 2006. After his execution, his lawyer claimed that prison authorities had illegally denied him access to Hidaka before his death.