Sayumi Michishige born July 13, 1989 in Ube, Yamaguchi Prefecture, Japan) is a sixth generation member of the J-pop group Morning Musume.
She joined Morning Musume in 2003 along with Eri Kamei, Miki Fujimoto and Reina Tanaka, which all made their debuts with Morning Musume in the group's nineteenth single, "Shabondama". In 2005 she was assigned as mentor to 7th generation member Koharu Kusumi, until Kusumi's graduation in December 2009.
Since 2005 she was assigned as mentor to 7th generation member Koharu Kusumi.
Michishige uses to identify herself with phrase "Usa-chan Peace" (Bunny Peace) While saying "Usa-chan peace" she holds her index and middle fingers in V shapes next to her ears.
