Fourth OVA release from the "Fist of the North Star" series (Toki Den). The century ends in a burst of nuclear flame and amidst the battle for the ultimate successor of the fist of the north star rises the name Toki. Called a genius by many, Toki also harbors an unspeakable secret, and the only person who knows it is a doctor named Sarah. Now that Kenshiro has been named the official successor, Toki sets out with Sarah to look for a way to use the fist of the north star for medicine.