|Also known as||Yasshy (やっしー?),Riho-Riho (りほりほ?)|
|Born||May 28, 1998|
|Origin||Higashihiroshima, Hiroshima prefecture, Japan|
|Associated acts||Morning Musume
Hello! Project Mobekimasu
Riho Sayashi (鞘師里保 Sayashi Riho, born May 28, 1998 in Hiroshima, Japan ) is a Japanese pop singer under Hello! Project. She is a ninth generation member of the Japanese pop group Morning Musume, along with Mizuki Fukumura, Erina Ikuta, and Kanon Suzuki. Her uncle, Tomoya Sayashi, is a former Japanese baseball player of the Hiroshima Toyo Carp of Japan's Central League. She is also a member of the duo Peaberry.
Prior to joining Morning Musume, Sayashi was a member of ASH (Actor's School Hiroshima).
Sayashi was one of the winners of the Jc&Jk actress audition and got a chance to perform in Morning Musume's Fashionable stage play.
The ninth generation members debuted in Morning Musume January 2, at the Hello! Project 2011 WINTER ~Kangei Shinsen Matsuri~ concert.
Sayashi's debut single in Morning Musume is titled "Maji Desu ka Ska!".
On March 27, 2011, It was announced Sayashi would be replacing Erina Mano for the radio show Mano Deli, renaming it Riho Deli.
On July 29, 2011 Sayashi was out of events for a few weeks to rest due to ischium nerve pain on her right side.
In July 2012, it was announced that Sayashi will be part of the new Hello! Project duo Peaberry, along with S/mileage's Ayaka Wada, and that they would perform their original song "Cabbage Hakusho" at the Hello! Project summer concerts. They were formed alongside the group DIY♡ to be part of Hello! SATOYAMA Life.
Hello! Project groups and units
- "Maji Desu ka Ska!" (April 6, 2011 )
- "Only You" (June 15, 2011 )
- "Kono Chikyū no Heiwa o Honki de Negatterun Da yo! / Kare to Issho ni Omise ga Shitai!" (September 21, 2011 )
- "Pyoco Pyoco Ultra" (January 25, 2012 )
- "Ren'ai Hunter" (April 11, 2012 )
- "One Two Three / The Matenrō Show" (July 4, 2012 )
- "Wakuteka Take a Chance" (October 10, 2012 )
- "Help Me!!" (January 23, 2013 )
- "Brainstorming / Kimi Sae Ireba Nani mo Iranai" (April 17, 2013 )
- "Wagamama Ki no Mama Ai no Joke / Ai no Gundan" (August 28, 2013 )
- "Egao no Kimi wa Taiyou sa / Kimi no Kawari wa Iyashinai / What is LOVE?" (January 29, 2014 )
- "Toki wo Koe Sora wo Koe / Password is 0" (April 16, 2014 )
- Hello! Project Mobekimasu
- "Busu ni Naranai Tetsugaku" (November 16, 2011)
- "Cabbage Hakusho ~Haru Hen~" February 27, 2013
|#||Title||Release date||Top position||Publisher/Notes|
|1||Sayashi Riho ~Greeting~ (さやし りほ～Ｇｒｅｅｔｉｎｇ～?)||August 31, 2011||51||Zetima|
|2||RIHO||January 20, 2012||—||e-Hello! series|
|3||Hyahhoi (ひゃっっほ～い♪( ´θ`)ノ Hyahhhōi?)||September 26, 2012||68||Zetima|
|4||Snowdrop (snowdrop?)||March 28, 2013||e-Hello! series|
|5||Riho's Fashion Archive||March 12, 2014||32||Zetima|
- Sayashi Riho (さやしりほ?) (August 27, 2011, Wani Books, ISBN 978-4-8470-4391-8)
- Un Deux Trois (アンドゥトゥア?) (August 27, 2012, Wani Books, ISBN 978-4-8470-4486-1)
- Bijo Gaku (美女学?) (2011)
- Hello Pro! Time (ハロプロ！Time?) (April 2011 – May 2012)
- Hello! Satoyama Life (ハロー!SATOYAMAライフ?) (June 2012 – present)
- Riho Deli (2011–)
- UstreaMusume (2011–)
- "つんく♂モー娘新メンバーに心強さ「日に日に顔が勇ましく」" (in Japanese). Searchina. 2011-01-04. Retrieved 2012-10-13.
- "モーニング娘。第9期メンバー決定！！" (in Japanese). Hello! Project. 2011-01-02. Retrieved 2012-10-13.
- "鞘師里保のDVDランキング、鞘師里保のプロフィールならオリコン芸能人事典-ORICON STYLE". Oricon Inc. Retrieved 2012-07-21.
- "e-Hello! 鞘師里保DVD 『RIHO』ダイジェスト - YouTube". 2012-01-19. Retrieved 2012-07-21.
- "モーニング娘。鞘師里保写真集『アンドゥトゥア』 12/08/27発売" (in Japanese). 2012-07-20. Retrieved 2012-10-15.