The Shadow Infiltration Organization (影の浸透機構, Kage no shintō kikō) is an organization created by Hibiki Tsukiyo with many different members all having some sort of relationship with Zancrow. It has vizards, shinigami's and shinigami with huge bounties on their head. Its only objective is to battle against Zancrow's organization and once they have pushed it back far enough they will find Zancrow. The organization is focused around soul society and finding its members.