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disc_cover gokou_ruri jpeg_artifacts kousaka_kirino makishima_saori ore_no_imouto_ga_konnani_kawaii_wake_ga_nai

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It looks like upscaled or overfiltered..
I doubt it. Since this disc isn't released yet, it must be a digital file which doesn't need "filter" too much.. The artifacts match upscaling's too. I'm going to delete it (and post #164496 maybe), any opinion?
It looks like upscaled and overfiltered.