Golden Kamuy OVA

Bundled with the 15th volume of the Golden Kamuy manga.
"Barato no Ugou" (Showdown in Barato) depicts the battle in Barato. Hijikata and Nagakura sides with the Hidoro clan and get information about the tattoed convicts in the city. On the other hand, Ogata joins Kusuda Umakichi and threatens the police chief to join his cause.