Ayaka Sajyou is a magus living in Fuyuki City attending school at Homurahara Academy. She is also a former student of the El-Melloi Classroom, having attended classes for about a month. In Fate/Prototype

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She’s the Master of Saber in the Second Tokyo Holy Grail War.

In Fate/strange Fake

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She's the "True" Master of Saber in the True and False Holy Grail Wars. Ayaka is recognized by Thia Escardos as a non-human being.