Kotoko originally belonged to Yoshiyuki , but following Chi 's kidnapping , Hideki and Shinbo force Yoshiyuki to transfer ownership of Kotoko to Hideki .
Chi 's memories force Yoshiyuki kidnapping Chi can not be erased .
Kotoko originally belonged to Yoshiyuki , but following Chi 's kidnapping , Hideki and Shinbo force Yoshiyuki to transfer ownership of Kotoko to Hideki so that her memories of Yoshiyuki kidnapping Chi can not be erased .