Kusumi Koharu (久住小春) was born on July 15, 1992 in Nagaoka, Niigata, Japan. She is a former member of Morning Musume and Hello! Project. She was also a voice actress for the anime Kirarin☆Revolution. She is currently a CanCam model and a member of Dream Morning Musume. She joined Morning Musume as the only seventh generation member and as the youngest soloist to debut in Hello! Project, being only twelve years old when she joined. Before she joined Morning Musume, she was the captain of her school’s volleyball team. Kusumi’s audition process and debut was documented during the 2005 episodes of TV Tokyo television show, Hello! Morning.
As a Hello! Project soloist, her highest selling single is Balalaika with 72,709 copies. Her lowest selling single is Hapi☆Hapi Sunday! with 14,468 copies sold.