Tsukasa SHIBA was one of the warriors of the Aizu clan dispatched in 1864 to the Shinsengumi which was being chased by troops which tried to capture the rest of the Shinsengumi members who caused the Ikeda-ya incident, and he caused a so-called Akihono-tei incident on July 13 in the same year and committed Seppuku, while aided by his elder brother to restore relations between the Aizu clan and Tosa clan.
元治元年、池田屋事件の残党狩りに追われる新選組に派遣された会津藩士の1人で、同年6月10日(旧暦)、いわゆる明保野亭事件を起こし、会津藩と土佐藩の関係修復のため兄の介錯のもと切腹した。