" Scathach  "

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The queen of the foreign territory・haunted ground called "Land of Shadows" and mentor of warriors, Scathath--- or so should be. But, at this occasion, she carried out the reckless deed of changing herself and several other female Servants around into swimsuits - all under the guise of adapting to the environment.
The result is this summer-style that you see. Scathath's own testimony is "it is fine to act like this sometimes".