While on vacation at the home of Dr. Gensai's niece, Kenshin and company attracts the attention of a wealthy but arrogant boy who wants to learn the art of swordfighting.

Though Kenshin tries to warn him of the bad influence, Yutaro continues to believe in Raijuta, unaware that the renegade is using him plot his revolution. So, when he's told that the government is out to stop him, Yutaro sneaks away to warn Raijuta.

After learning the truth behind Raijuta's duplicitous plan, an injury sidelines Yutaro, leaving Kenshin to fight the renegade Samurai alone.

With his arm nearly healed, Yutaro and his doctor arrive for a visit at the dojo.

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

Using the clues left behind by Dr. Hans, Kenshin and company are led to the hidden shrine that holds the key to the miracle cure.

After surviving a fall into a volcano, the Peace Force comes across an injured Sanada Ninja who offers to help battle his former allies.

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.