Fai is an engineer, Kurogane a soldier. Kurogane was sent home with only one arm, and Fai built him a new one. Coming together will expose all their carefully guarded secrets and may just change the course of the war.
Fai and Kurogane have a chance meeting at a party. Modern setting alternate universe where Fai is a Wilderling (dancer-character) and Kuro a Protector.
The story of Tsubasa transported to modern-day San Francisco, with Kurogane and Fai as college students.
Probably my favorite Tsubasa fanfiction!