S01E27 - Burn, Island of Terror!
Synopsis
Kenshin helps to nurse Shura back to health, then Shura finds out that Ginjo gave Old Iwa opium. Shura goes off to fight and defeat Ginjo. She is defeated by him, since he played a dirty trick on her. Kenshin then comes in and uses the Ryu Tsui Sen to end the fight. Geki then throws a bomb, destroying Kairyu Island and all its inhabitants, except for Kenshin and Shura.