One of Yushin's early robot creations, predating the Agnate series. He was created to infiltrate and eliminate the targets Yushin chose.

Some time after the rising threats of the Flame Seekers, Karitori was not really used often, so he look into the folders in his time.

The discovery of the truth on his creator's scheme, he infiltrated the Flame Seekers Hideout, with no help. Seeing the contrast to civilians at the base compared to home, would lead to Karitori's decision to turncoat his creator, and provided his services to the Flame Seekers.