Based on a manga that has led to several anime treatments in recent years, “Golden Kamuy” struggles onto the screen in live action feature film form as a cartoonish curiosity.

A post Russo-Japanese War period piece about a treasure hunt involving tattooed ex-convicts, with soldiers, an ex-soldier, an aged ex-samurai, mobsters and an Ainu huntress, it features action and supernaturalism and enough exposition and characters to fill three two hour movies.

Ainu mores and customs are glimpsed in the midst of a lot of chasing and fighting in pursuit of 24 convicts, each of whom has clues from a puzzle tattooed on their torsos by an inmate who hid a cache of “cursed” gold after that 1904-1905 war.

It’s very “manga” in look and feel, more steam punk than period-perfect. Despite efforts to recreate the battlefields of northeastern China, near the Russian-held city of Port Arthur, and the wilds of wintry, primitive Hokkaido, this Shigeaki Kubo film never shakes the feeling of “fan service” in its plotting and a not-quite-whimsical enough “anime rendered into live action” tone.

Being ever so Japanese, there are pauses for food and discussions of food at the damnedest times — minced squirrel here, skewered dumplings there, otter served the traditional Ainu (a hunter-gatherer subculture) way, and miso which the main Ainu character amusingly describes as having the texture and smell of “feces.”

We get a taste of the origin story of our hero, the battle-scarred Saichi (Kento Yamazaki) who labeled himself “Immortal Sugimito” after his supernatural survival of battle wounds in the war.

“I just can’t seem to die!”

He hears tell of this gold treasure from a traveling companion as he pans for gold in Hokkaido. That’s when he realizes that 24 escaped prison inmates collectively carry the map to this treasure horde.

Saved from a brown bear attack by the young Ainu huntress Aspira (Anna Yamada), she becomes his new traveling companion guide to all things Ainu on this quest to track down the various inmates — brutes, escape artists, etc.

Meanwhile, The Seventh Division, led by Toshizô Hijikata (Hiroshi Tashu) has turned its post-war mission into one of finding those inmates and that treasure. And he’s not alone.

The story is relatively straightforward, or would be if we weren’t pausing for the inclusion of every supporting character, some of them quite minor, who must be introduced and identified by (inter-titles) name.

That’s “fan service” that does the movie no service.

Still, it’s an interesting peek into a part of Japan, Japanese history and culture — especially the forcibly “assimilated” Ainu — that the movies seldom visit even if the story is pieced together between chases, fights and standoffs.

Rating: TV-MA, violence, off-color humor

Cast: Kento Yamazaki, Anna Yamada, Hiroshi Tashi, many others.

Credits: Directed by Shigeaki Kubo, scripted by Tsutomu Kuroiwa, based ont he manga by Satoru Noda. A Netflix release.

Running time: 2:07