specifically this version of fate/extra:
Fate/EXTRA みこーん！ キャス狐ちゃん!?
Fate/Extra - Mikon! Kyasuko-chan!?
Fate/Extra CCC Fox Tail
^ all three seem to refer to the same manga
someone put the first chapter up online at the beginning
of the month on some forum i stumbled on
here is the second to last page of the first chapter