When a letter from Dr. Hans reveals the story of the miraculous medicine, Yutaro joins the Peace Force in an effort to find it.

After their search leads them to the hidden cure, the leader of the Black Knights makes it clear that he has no intention of honoring his promise to cede control of Japan to the Sanada Ninjas.

As he faces off against the Black Knight's leader, Kenshin must rely on his brains and not his sword to win the battle.

The Water family's efforts to gain control of the Ki have left Kaoru seriously wounded.