I've used tineye and google image search, also searched for shinobu monogatari and other related keywords.
I can't seem to find the full image that this was cropped from. Can /r/ help me?
It's possible Waifu2x upscaler was used but I'm not sure.
http://waifu2x.udp.jp/index.html
Thanks in advance.
I swear I've seen it before but I can't find it.