Naoto Yamanishi (山西直人 Yamanishi Naoto), commonly referred to by his surname Yamanishi, is a major character in the Bible Black: New Testament series.

He becomes caught up in a demonic plot when investigating several puzzling murders. He is confronted by his boyhood crush Reika Kitami and the mysterious Jody Crowley, who both corrupt his mind.

He is a young police investigator, carrying a gun, badge and cuffs. He regularly works with his older partner, who is presumably his superior officer, though they both report to a police chief.