Danbooru-based image board with a specialization in high-quality images.
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aki_minoriko aki_shizuha ideolo inubashiri_momiji kawashiro_nitori kochiya_sanae moriya_suwako scanning_dust shameimaru_aya touhou yasaka_kanako

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Someone has processed it but I can see aliasing? That's why I thought it may have been upscaled
it's a scan. but not having the resolution info, maybe due to the matter of down sized resolution from the scanning resolution.
aliasing is a problem of resizing not only upscaling also downscaling.