Asirpa and Sugimoto are back in Hokkaido at last and determined to find the Ainu gold for themselves. Lieutenant Tsurumi and Hijikata are also hot on their trail. While Sugimoto and Shiraishi work on a plan to find a strange tattooed prisoner named Botaro the Pirate, a series of horrific murders in Sapporo draws Hijikata's attention. Lieutenant Tsurumi sends Tanigaki to kill Sugimoto, but the loyal Matagi has only one true goal--finding Inkarmat!