Danbooru-based image board with a specialization in high-quality images.
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gundam gundam_unicorn mecha nakada_eiji unicorn_gundam

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Meta-tags on the frontpage describes its content as follows:

moe.imouto.org - A Danbooru focusing on High Resolution Anime Scans, Ecchi Scans, Hentai Scans, Moe Scans, and Bishoujo Scans; No registration required, no ads, & unlimited downloads.

Alright, digital artworks through a nice wrench in there... but as long as it's in the category "High Resolution Anime Scans" as it is stated there, it is generally tolerated.

These kinds of pictures is why there is a mecha tag, so you can blacklist it if you don't want to see it.
There is ads, they are just all for jlist
I just copies them as I sees them :P