As Kaoru continues her training of Daigoro, Kenshin is warned to steer clear of the young man's teacher, Kaishu Katsu.

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

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