I thought I'd stop by my local Japanese post office and see what they had. Here are a few of the issues they had on sale.
If anyone would like copies of any of these, I'd be glad to pick some up for you for face value + actual shipping via USPS. Current exchange rate is about ¥90 per US$1.

Japanese Mountains Series 2 -- 22 Feb 2013 (¥800)

Ukiyo-e (woodblock art) Series 1 -- 1 Aug 2012 (¥800)

Philately Week 2012 -- 20 Apr 2012 (¥800)

Afforestation Series, Yamaguchi Prefecture -- 27 May 2012 (¥500)

International Letter Writing Week (¥90) -- 9 Oct 2011 (¥900) -- Scott 3379

International Letter Writing Week (¥110) -- 9 Oct 2011 (¥1100) -- Scott 3380

International Letter Writing Week (¥130) -- 9 Oct 2011 (¥1300) -- Scott 3381

The World Heritage, Sheet 6 -- 29 Jun 2012 (¥800)

Travel Scenes, Series 11 (Hokkaido Winter to Spring) -- 1 Feb 2011 (¥800) -- Scott 3302

Travel Scenes, Series 12 (Hokkaido Summer) -- 30 May 2011 (¥800) -- Scott 3333

Travel Scenes, Series 16 (Nagasaki) -- 11 Sep 2012 (¥800)

60th Anniversary of Local Autonomy Law, Kumamoto Prefecture -- 13 May 2011 (¥400) -- Scott 3331

60th Anniversary of Local Autonomy Law, Tottori Prefecture -- 15 Aug 2011 (¥400) -- Scott 3350

60th Anniversary of Local Autonomy Law, Shiga Prefecture -- 14 Oct 2011 (¥400) -- Scott 3382

60th Anniversary of Local Autonomy Law, Iwate Prefecture -- 15 Nov 2011 (¥400) -- Scott 3392

60th Anniversary of Local Autonomy Law, Okinawa Prefecture -- 13 Apr 2012 (¥400)

60th Anniversary of Local Autonomy Law, Kanagawa Prefecture -- 13 Jul 2012 (¥400)

60th Anniversary of Local Autonomy Law, Miyazaki Prefecture -- 15 Aug 2012 (¥400)

60th Anniversary of Local Autonomy Law, Tochigi Prefecture -- 15 Oct 2012 (¥400)

60th Anniversary of Local Autonomy Law, #332;ita Prefecture -- 15 Nov 2012 (¥400)

60th Anniversary of Local Autonomy Law, Hy#333;go Prefecture -- 15 Jan 2013 (¥400)