By Sanpei Shirato (白土三平) / Akame Productions. Reprints of Kamui Gaiden (カムイ外伝) stories from Big Comic magazine (1982-87). These are not the Kamui Den (カムイ伝) stories from 1960s Garo magazine.
Ryan Holmberg revealed in a 11/24/21 TCJ article that this series was actually drawn by Shirato's brother Okamoto Tetsuji (岡本鉄二), uncredited.