While Sugimoto's group prepare to move on, Hijikata is in near Kushiro, searching for clues to a small object which the former prisoner called Shinzo Doi, also known as "Yoichiro the Manslayer", had in Abashiri prison. His group meets an Ainu called Kiraushi who explains that the object is a "kotan", part of a male puffin's beak and he takes them to nearby Nemuro where there is a breeding colony...