"He is in charge of the bizarre serial murder case division. An elite crime investigative administrator."
After Katsuya's cooperation with Kei Nanjo to investigate Takahisa Kandori's Science Lab in Narumi Ward, he learns that Shimazu has been leaking the phone call records and covering the mafia's abduction of JOKER Curse users, meaning the whole police investigation team under Shimazu has been conspiring with the New World Order all along, except for Katsuya himself. When Chief Togashi reveals himself to be leaking information for Katsuya in Aoba Park concert hall, Shimazu appears with a team of SAT to take down Togashi and fatally injures him, but is defeated by Katsuya and Maya Amano. Shimazu tells them that they intentionally let Togashi betray the order to gain public awareness of the organization, which is essential in turning rumors into reality. After Shimazu's defeat, Katsuya handcuffs Shimazu so he does not "die as a public servant". Shimazu remains unrepentant, saying "It was...to create an 'innocent' world...I am...not wrong..." before he dies.
- Shimazu is aided by four SAT.
- Shimazu has a voicemail message that can be listened to after clearing the Extra Dungeon at S rank. He speaks uncharacteristically enthusiastically.
- His English chuckle is reused in Shin Megami Tensei III: Nocturne as Red Rider's spell casting voice.