IQDB and SauceNAO gives nothing, and Google gives me 2ch thread logs that don't provide sources anyway.
I'm not even sure if it's a standalone picture or a it's from a VN.
bump im quite interested in this pic as well i hope a different anon finds this
it might be based of fategrandorder character drawn in a different perspective.. i could be wrong ... the 2ch thread people were making characters into fallen forms so im not too sure to be honest
Image aligned wrong.
http://konachan.com/post?tags=mahou_kenki_arch_calibur