Danbooru-based image board with a specialization in high-quality images.
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ascoeur calendar kiddy_girl-and kiddy_grade wallpaper wave_ride

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Hmm...that's a zoom layer right?

EDIT: Ahh crap, forgot that it's not a valid tag here. Too much konachan for me.
Yes it is a zoom layer. Ehheeh habits carry over from other sites at times don't worry about it. : ) While on that note I make it my mission on next trip to store to buy this calendar.
It isn't a paper calendar - Sugimura Tomokazu puts up a wallpaper calendar image up like this monthly on his site

http://over-drive-cg.jp/karenda-.htm
http://over-drive-cg.jp/karenda-/
http://www1.interq.or.jp/nerve/karenda-.htm

Most if not all of his work is published on CD or for download rather than on paper.