The son of Hisau Maiya. After she got raped by a soldier and gave birth, she had to abandon her child. He was then taken in by the government and given the name Sigma, and was briefly mentioned in Fate/Zero.
In his debut in Fate/Strange Fake he was meant to summon True Lancer, but he summoned Watcher instead, with their shadows claiming they will guide him on his path to become True Lancer himself.
