From the NHK website:

"NHK's international broadcasting service, NHK WORLD, produces souvenir
calendars each year featuring twelve prize-winning photographs from an
annual photo contest. Beautiful scenes of the seasons are captured by the
fresh gaze of amateur cameramen across Japan, and have long been treasured
by our audiences.

The photographs on this year's NHK World Calendar can be downloaded as
wallpaper for your personal computer, by clicking on the button below.
Wallpapers will be updated once a month."

http://www.nhk.or.jp/rj/wall_e.html