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

amakara_surume autographed chibi game-style hatori_piyoko kazaura_kotone kazaura_shiho koisuru_shimai_no_sextet peassoft seifuku thighhighs wallpaper

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For the "clean" (twitter background like) version: http://www.game-style.jp/style/201312/1312background_wall_a.jpg

Glab it ASAP while it lasts - the link may not last long once the monthly background advert is replaced by the middle of next month.