教えて!シエル先生 シエル先生 メガネオフ
The second ascension of C.I.E.L from the game Fate/Grand Order. In this ascension she is called [[Ciel-Sensei]], this is based off the bad end corners in the visual novel Tsukihime -A piece of blue glass moon.

She wears a two-sided jacket over a collared white shirt with partially rolled up sleeves, a pair of black gloves and a black necktie emblazoned with a Latin cross. She also wears a black skirt with several belts, including a belt pouch as well as a sheathed sword, black pantyhose and black knee boots with heels.
c.i.e.l (second ascension) (fate)