Shotaro Hidari (左 翔太郎, Hidari Shōtarō) portrayed by Renn Kiriyama (桐山 漣, Kiriyama Ren) is a private investigator who works alongside Philip in the Narumi Detective Office in the city of Futo as the left hand side of Kamen Rider Double (仮面ライダーダブル, Kamen Raidā Daburu).