Criminal Profiling and Psychological Report of a Serial Rape and Murder case in Gunma Prefecture, Japan

This study presents a comprehensive criminal psychological analysis and offender profiling of a series of homicide and rape offenses committed by Okubo Kiyoshi in Gunma Prefecture, Japan, between March 31 and May 10, 1971. The offender systematically targeted young women under the guise of professional engagement, resulting in 10 incidents of sexual assault, eight of which culminated in murder. Following his arrest, Okubo was convicted and subsequently executed. This case exemplifies a pattern of instrumental and sexually motivated violence, underpinned by personality pathology, paraphilic tendencies, and a history of prior offenses. The analysis delineates the psychological stages of the offense, including the latent, malignant transformation, implementation, and decline phases. Particular emphasis is placed on the role of personality disorders, revenge motivation, and the criminogenic dynamics of recidivism. The findings contribute to the understanding of serial criminal behavior and inform strategies for criminal psychological assessment and prevention.