Josuke is a young man afflicted by retrograde amnesia, lacking any memories prior to being discovered by Yasuho Hirose near the Wall Eyes in Morioh Town. According to Karera Sakunami, Josuke's true identity is Josefumi Kujo (空条 仗世文 Kūjō Josefumi), and became his current self after fusing with the man Yoshikage Kira (吉良 吉影 Kira Yoshikage).