Useless is the 36th chapter of the Golden Kamuy manga.
Asirpa continues to teach about hunting to Sugimoto and Shiraishi and this time they hunt a tanuki, but this time. When they catch it escapes but Ryu helps them. Shiraishi after seeing Ryu comes up with the idea of using him to follow the trail of people and goes to Tanigaki Genjirou to teach him how to do so. After training Ryu, Shiraishi follows the trail and manages to find Ushiyama Tatsuma.