The OVA will ship with the manga's 19th volume on September 19. Hitoshi Nanba is returning to direct the OVA at Geno Studio. The 23-minute anime will center on the manga's Monster arc. Banjou Ginga will play Kiichirō Wakayama, and Hideyuki Tanaka will play Tatsuya Nakazawa.
The manga's 15th compiled book volume shipped last September, and it bundled an anime DVD focusing on the manga's Barato arc. The manga's 17th volume shipped on March 19, and it also bundled an anime DVD.
Viz Media is releasing the manga in English, and it describes the first volume:
In the early twentieth century, Russo-Japanese War veteran Saichi “Immortal” Sugimoto scratches out a meager existence during the postwar gold rush in the wilderness of Hokkaido. When he stumbles across a map to a fortune in hidden Ainu gold, he sets off on a treacherous quest to find it. But Sugimoto is not the only interested party, and everyone who knows about the gold will kill to possess it! Faced with the harsh conditions of the northern wilderness, ruthless criminals and rogue Japanese soldiers, Sugimoto will need all his skills and luck—and the help of an Ainu girl named Asirpa—to survive.
The anime's first season premiered last April. Crunchyroll streamed the series with English subtitles as it aired in Japan, and Funimation streamed it with an English dub. The second season premiered last October. Crunchyroll streamed the series as it aired, and Funimation began streaming an English dub last October.
Sources: Golden Kamuy anime's website