Ok, I have no idea how to tag this. This is a character named Emily, from what I think is a fanmade RPG (or just a video simulating an rpg?) named Chikyuu Boutai no Kessen, made by Takahashi Kuniko.
I figured it out, actually. Some guy has been posting gameplay videos of little RPGs that his sister made (妹が作った痛いRPG). They're really weird, though more like flash games than RPGs. This particular one starts out with a guy killing a God with Jesus Flash...
I will create tags for it, though I doubt they'll ever get used again.