This image is a scan from the Watamote CD 2 extra OST. I don't know if a complete digital version of this illustration exists, or at least I haven't been able to find one. I did a few things to it in Lightroom. The image in post 1477799 has horizontal cropping, but this version has vertical cropping, which is disappointing for me since I can't find a complete version, if one even exists.