Sayumi Michishige is a Japanese entertainer known primarily for her career as a singer and idol, with a limited but notable foray into anime voice acting. Her sole confirmed voice role in an anime production is Arisa in the 2017 web short series Henkei Shoujo.

Michishige's career has been predominantly defined by her long-standing membership in the iconic J-pop group Morning Musume. She joined the group in 2003 as a sixth-generation member and remained with them until her graduation in November 2014. During her tenure, she became the group's eighth leader in May 2012 and also served as the leader of Hello! Project, the collective of artists under the Up-Front agency. Her time in Morning Musume, spanning over 11 years, made her one of the longest-serving members in the group's history at the time of her departure. Following her graduation, she took a hiatus from entertainment before resuming activities in 2017.

In 2017, Michishige expanded her performance portfolio to include anime voice acting. She was cast as the voice of Arisa in the short-form anime series Henkei Shoujo. Her involvement was announced in October 2017 for the series' fifth episode. The character Arisa is a high school girl who has the ability to transform into an okonomiyaki cooking machine. The official character profile describes her as someone who enjoys taking cute pictures for Instagram and has a fondness for cooking, particularly fried rice.

Based on available information, Michishige's work on Henkei Shoujo represents her only known credit in anime voice acting. Consequently, there are no documented recurring collaborations with specific anime directors, studios, or fellow voice actors. Her achievement in this field is the successful portrayal of a single character in an internationally distributed web series that garnered millions of views. Her role as Arisa remains a distinct but minor entry in a career overwhelmingly focused on her work as a recording artist and stage performer.