Danbooru-based image board with a specialization in high-quality images.
amagai_yukino candysoft kanisawa_kinu kanisawa_sanagi kurogane_otome seifuku tsushima_hakari tsuyokiss tsuyokiss_festival tsuyokiss_next wallpaper yashi_nagomi

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Probably just something related to April's Fool day (see the ridiculous specs in the Product page: http://www.candysoft.jp/ohp/tk-4_1/main_pro.html )