The original Japanese version of the game is a semi-autobiography based on the teenage high school years of the creator, Yoshihisa Kishimoto, with the protagonist Kunio-kun loosely based on himself. A self-proclaimed rebellious youth, Kishimoto says he got into fights in school on a daily basis, which, he explains in retrospect, was partially the result of a rough break-up. "There were family reasons as well, but there was a girl and she dumped me, which pulled the trigger," he says.