Characters from the novel Voyage to the Moon World which was later incorporated into the anime (collected on the DVD Rurouni Kenshin: Dreams of Youth). Katsu Kaishū (勝海舟) (Kōsei Yagi)
Former student of Kaishū. Studied in England where he learned fencing. He became a corrupt government official and is secretly agitating the Beniaoi in attempt to gain the hidden Tokugawa treasure.