Despite his breaking a long-standing national record, Shibata only won at the Japan Championships in Athletics on one occasion, taking the 1500 m title in 1997. That same year he won a gold medal in the event at the East Asian Games in a then games record time of 3:49.90 minutes. The following year he won the second and final international medal of his career at the 1998 Asian Athletics Championships by finishing as runner-up behind multiple Asian champion Mohamed Suleiman. He also ran at the 1998 Asian Games and placed seventh in the 1500 m final.