謎の代行者C.I.E.L シエル(水着) オープン・サマー
The initial ascension of C.I.E.L from the game Fate/Grand Order. In this ascension she is called Mysterious Executor Ciel.

She wears a swimsuit which is a black bikini under a see-through dress with an open cropped black hoodie jacket with some white highlights over it. She also wears a cross necklace, thigh pouch and a pair of laced sneakers.
c.i.e.l (first ascension) (fate)