Rurouni Kenshin: Meiji Kenkaku Romantan

Synopsis

Misao tells Kenshin, Kaoru, and Yahiko about the secret between Shougo and Lady Magdalia. Shougo was once able to help cure numerous due to his study under the field of medicine, however he is unable to cure his dying younger sister. When the two were younger, their parents were killed one after another by nonbelievers. Kenshin, Kaoru, Yahiko, and Misao sees that Santo is signalling the formation of an army from his boat. Lady Magdalia is informed that Kaiou has her medallion, alerting her to search for it in his room. She later realizes that Kaiou plans to betray Shougo and her. Sanosuke and Shouzo show up, trying to stop Kaiou, only to allow the three of them to be locked into the cage, as an avalanche of boulders plummet over them.

(Source: Wikipedia)