After losing his mother and being himself severely injured in an explosion, his wounds are treated. He grows up to become the manga character, BlackJack 21. As a roving clandestine doctor, he treats those who are at death's door. In so doing, he is able to charge absolute fortune. As his techniques are outside of the normal medical practices, he's shunned by the medical profession and so operates as an underground surgeon, along with his trusty companion, Pinoko. In a way, he gambles with life.