He was originally an excellent student, but he failed to enter the University of Tsukuba, his target college.

In April 1989, he moved to Hiroshima and began to work as a taxi driver.

Hidaka married in 1991, and had a daughter in 1993, but his wife entered a mental hospital.

Hidaka killed and robbed four women between April and September 1996.

[1][2][3] After his execution, his lawyer, Shuichi Adachi, protested that he had been illegally refused access to his client by prison authorities.