Abe no Sōsei commands the Yamainu, an elite military unit tasked with confronting the Orochi threat. He wields specialized combat expertise focused on incapacitating foes through precise strikes to vital pressure points. Prior to the main story, he shared a close bond with Tenka Kumō, a friendship fractured by Tenka's subsequent actions. During the decisive battle against Orochi, Sōsei's katana proved crucial in severing the serpent entity from Soramaru Kumō. His investigations continue into the post-Orochi era, uncovering forbidden human experiments by former Yamainu members attempting to resurrect Orochi, directly violating the ban established after Orochi's initial defeat. His surname "Abe no" links him to another figure in the series' lore, Abe no Hirari. Sōsei's actions consistently reflect his dedication to eradicating supernatural threats and enforcing the government's directives.