It's said that 1 in 100 children are born with congenital heart disease. Yamagishi Masaaki has saved the lives of over 4,000 children and invented many new surgical techniques for diseases once impossible to treat. With skills developed by working harder than anyone, he repeatedly makes incisions and stitches less than a millimeter in size, bringing hearts back from the danger of failing. In his youth, he himself lost his younger brother to a heart disease. Now, he rushes between 3 hospitals, standing at the border between life and death. This is the story of a surgeon who has devoted his life to saving lives.