Shotaro Hidari is the left half side of Kamen Rider Double. He is a self-dubbed "hardboiled detective", though considered "half-boiled" by others, who dresses in the style from the 1970s. He works as a detective in the city of Futo under his mentor Sokichi Narumi who died in an attempt to save Philippe. Refusing to let his mentor's death be in vain, Shotaro works to stop the Dopant crime wave, forming the left half of Double and providing the Rider as a whole with a body.