鞘師里保 (Sayashi Riho) is a Japanese dancer and actress. She is a former idol under Hello! Project as a 9th generation member of Morning Musume. and the SATOYAMA movement duo Peaberry. She was the most popular member out of Morning Musume.'s 2011 additions. Starting with "Only you", her second single as a member, she was pushed into becoming one of the group's central figures as a main vocalist and dancer, which led to her being named the group's "absolute ace" (絶対的エース; zettaiteki ace) by media. Sayashi graduated from Morning Musume. at the end of 2015 and took a break from Hello! Project activities to study language and dance abroad. On December 7, 2018, it was announced that her contract with UP-FRONT PROMOTION expired at the end of November 2018 and she had subsequently graduated from Hello! Project. Despite her departure, she made her return to entertainment activities on March 30, 2019 as a guest in Hello! Project's annual Hina Fes concert. In late June 2019, she began performing as a support dancer for the kawaii metal band BABYMETAL. 鞘師里保(1998년생, Higashihiroshima, Hiroshima, Japan) 는 배우로, 대표작으로 11인의 적군, Hawaii FC Tour 2014 ～モーニング娘。'14～, ハロー!チャンネル Vol.7가 있으며, 그 외에도 二軒目どうする?~ツマミのハナシ~, めちゃ2イケてるッ!, 수학♥여자학원, 그 아이의 꿈을 꾸었습니다, ハロプロ!TIME, 멘쯔유 혼밥, 나의 귀여움은 곧 소비 기한!?, HEY!HEY!HEY! MUSIC CHAMP, 『ぷっ』すま, 샤베쿠리007, 모모우메, 나는 시원시원하니까 등 다양한 작품에 출연했다. 특히 2026년에는 付き合ってあげてもいいかな에도 참여해서 활동중이다. (오뜨랑에서 실시간으로 번역된 한글 프로필도 확인할 수 있어요) 2026년 우리가 사귀어도 괜찮을까에서 Saeko Sawatari 역을 맡았다. 2026년 『デスノート THE MUSICAL』에서 Misa Amane 역을 맡았다. 2025년 憶えのない殺人에서 奥田沙苗 역을 맡았다.