Danbooru-based image board with a specialization in high-quality images.

ishikei nise_midi_doronokai

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If I had got this from http://e-shuushuu.net/image/168885/ then I would have added the source. Don't assume where the original image was from.
I don't think it's useful to set a "source" for posts from another image board, anyway. They're very rarely actually the source.