It is estimated that between 1,300 to 2,000 people die because of medical accidents in Japan every year. The Medical Accident Investigation Committee (MAIC) exposes the darkness lurking behind these accidents. Its members – doctors and lawyers – conduct undercover investigations at suspicious hospitals and medical care facilities. Hanaoka Akira (Tanihara Shosuke), a gastroenterologist, is the leader of the MAIC’s Seventh Unit. When he has doubts about a place he has infiltrated, he will tenaciously investigate until he gets proof and zeroes in on the truth.