In [[1864]] He became captain of the 3rd unit of [[Shinsengumi]].
In [[1864]] He became captain of the 3rd unit of [[Shinsengumi]].
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When [[Ito Kashitaro]] group formed [[Goryo Eji]], Saito joined them as a spy.
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When [[Ito Kashitaro]] group formed [[Goryo Eji]], Saito joined them as a spy and detected their plan of assassination of [[Kondo Isami]] which resulted Ito Kashitaro was assassinated by Shinsengumi.([[Incident at Aburano Koji]])