Matsunaga Koharu

 (松永小春), better known as Koharu (小春), is the accordionist of Charan Po Rantan. She also writes the group's music alongside her sister Momo.

She began her career in 2004 as a member of the instrumental band MINORITY ORCHESTRA.

On September 1, 2021, she announced that she and Momo had left Sony Music and founded the agency Gestalt.

Trivia

 * Her mother, Matsunaga Aki (まつながあき), is an illustrator and designer.
 * She has an art Instagram.