Golden Kamuy OVA
Anime DVD bundled with a limited edition of the manga's 15th volume.
The story will focus on the manga's Barato arc, and includes a conflict between sniper Ogata Hyakunosuke and Bakumatsu hero Hijikata Toshizou.
[Source: Anime News Network]
Official ways to watch
We aren't aware of any official ways to watch this title.