Sylphynford Tachibana

Sylphynford Tachibana is a character in Fate/Corruption. She's the heir to the noble Tachibana House of Fuyuki City--this is the first, and so far only, time they've ever participated in the Holy Grail Wars--as well as the Fake Master of the Ruler Class Servant. The World chose her to serve as it's fake Master, even though The World itself is actaully the Master of Ruler.