Medical errors continue to exist today. Yoshimasa Nagao, a doctor at Nagoya University Hospital, is fighting to prevent such errors and minimize the harm they cause. With the conviction "No hiding, no deceiving, no running away" he questions attending physicians and thoroughly investigates the causes behind incidents. He's resolutely dealt with various problems that have occurred in the hospital. We pursue Nagao's philosophy as a doctor who has pioneered the field of patient safety.