Season 4

As Sugimoto and the members of the 7th Division head back into Japanese territory, they're attacked by a sniper.

Kadokura challenges Sekiya, one of the tattooed prisoners, to a deadly game in order to save the life of Hijikata.

The members of the 7th hunt a strange man at the Noboribetsu hot springs.

When Koito was fourteen years old, he had a chance encounter with Lieutenant Tsurumi. When he was sixteen years old, he was kidnapped by men who spoke Russian, and only Lieutenant Tsurumi could save him.

Asirpa looks for a way to pass down Ainu culture to later generations.

Sugimoto and Asirpa prepare to meet the main unit of the 7th Division.

Asirpa comes face to face with the 7th Division, and doesn't like what she sees.

The crew meets a very unusual character in the Hokkaido woods, who says he's being stalked by a bear.

Shiraishi comes up with a new way to find the gold while the 7th Division goes after a serial killer in Sapporo.

Tanigaki goes after Inkarmat, who is pregnant with his child and being held by the 7th Division.

The steamship that Sugimoto's party is riding on is attacked by Botaro the pirate.

Usami and Kikuta search out a bizarre serial killer in Sapporo while Sugimoto fights a desperate underwater battle.

Usami and Kikuta remain on the hunt for the killer as Botaro tries to unravel the mystery of Asirpa and Sugimoto's relationship.