Sayashi Riho solo Blu-ray release on April 8, photobook this March- http://www.sonymusicshop.jp/m/item/itemShw.php?cd=EPXE000005063
Sayashi Riho's upcoming solo Blu-ray is titled 'Sixteen'- http://www.helloproject.com/release/detail/EPXE-5063/
Release date for Sayashi Riho's upcoming photobook is March 25. Title: 「十六歳」 'Ju roku-sai' - http://www.helloproject.com/news/2502/
Sayashi Riho's next photobook "Sixteen" is 18+ according to Amazon Japan ;-P- http://www.amazon.co.jp/gp/product/4847047427
Sayashi Riho 'Juurokusai' photobook cover - http://www.wani.co.jp/event.php?id=4645
Sayashi Riho photobook previews from Weekly Playboy
Sayashi Riho - 'sixteen' Blu-ray cover- http://www.helloproject.com/morningmusume/release/detail/EPXE-5063/
Barks reports on Sayashi Riho's photobook release event- http://www.barks.jp/news/?id=1000114140
[EN] Riho Sayashi Blu-ray digest on YouTube:-