Shigeru was a Yakuza member, and one of the two witnesses of Kienji's murder. Even though he worked with Kienji and Shawn who were subsequently killed, he somehow ended up as the new Yakuza leader after Yuuma's death.
Sift Heads 4: Vinnie's Paradise[]
Shigeru appears (without being named) for the first time in Sift Heads 4, in the mission called Shadow of the Traditions. The player has to tell between him, Shawn and Kienji in order to kill the correct target, as they all look the same in this game.
Sift Renegade 3[]
Shigeru appears in two missions: "The Grand Hotel" where he is knocked out by Kiro, and "The Case Kienji" along with Shawn and Kienji.
Sift Renegade 3: Defiance[]
After Kienji has found that Yuuma is betraying the clan, he tries to contact Kiro, but only finds Shigeru, who says Kiro is on another mission but promises to take Kienji to him. On the way, they find Hayate tied to a chair, but it is a trap. Kienji warns Shigeru just in time so he escapes alive. Later, they find Shawn, who insists that Kienji tell what is going on. Right before Kienji can reveal details about a betrayal among the Yakuza, Vinnie shoots him down from a distance. Shigeru would later mysteriously disappear and move up in the ranks of the Yakuza.
Sift Heads Street Wars[]
Shigeru appears in the intro of Sift Heads Street Wars alongside his partner as they run down an underground tunnel and broke security guard's neck. He doesn't appear in the game itself. This time, Shigeru looks completely different, he now has a scar on his eye and a snake tattoo on his body.
Sift Heads Cartels: Act 3[]
Shigeru finally appears in SHC3. He tries to break into Vinnie's house through the window, but Vinnie receives a message that someone is breaking into the house. Quickly, Vinnie dodges an attack at Shigeru and the two begin to fight. Shigeru and Vinnie end up falling out the window and land on a lower part of the roof. Shigeru tries to kick Vinnie off, but Vinnie is faster and grabs his leg and the two fall together. Shigeru ends with an iron bar across his body. The partner helps Shigeru escape and tries to kill Vinnie, but Kiro arrives and shoots at their car, so the partner flees with Shigeru. Kiro chases the Yakuza on his bike, but soon is out of bullets. Vinnie then arrives and crashes his car into the Yakuza. Shigeru's partner disappears, and Vinnie and Kiro follow Shigeru into the Yakuza HQ. Vinnie manages to kill Shigeru and escape out of the Yakuza HQ alive, but he gets arrested by the police.
Sift Heads Rush[]
Shigeru's death is mentioned by his partner, who meets with Luzio and the last remaining Russian Boss to discuss how to put an end to Vinnie's crew.