After a train collides with a bus at a level crossing, dozens of injured are rushed to Hongoshi University Hospital.[a] However, the hospital is short-staffed as most of the interns are in a protest. Intern Maiko Okamoto reluctantly recruits 22-year-old medical student Kuroo Hazama (Black Jack) to help in the hospital. One of the patients from the accident is a young boy whose right arm and left leg are severed. A senior surgeon suggests amputation, but Hazama offers replantation for a fee of 5 million yen, to which the boy's parents agree. Heading to his friend Dr. Yabu's private clinic, he successfully reattaches the boy's limbs in his first-ever surgery. However, the boy's father pays only 10% of the agreed price after learning that Hazama is still a student.