Nureginu Yamiguchi

An assassin part of the second Killing Name family, the Yamiguchi. Nureginu has never shown his face to anyone except his master, leading to his identity being unknown to many. He has a habit of saying "Don't resent me" when he's attacking others. He's also a member of the Thirteen Stairs.

In Ningen Knock, Nureginu is a "piece" in Shiogi's plan to takedown Zerozaki Soushiki. He utilises small balls paired with a gas gun to mess with the Zerozaki's killing instinct, causing Soushiki to almost die. However, Nureginu failed to notice Soushiki setting up traps that ultimately cumulated in Nureginu's loss and retreat.