The two sisters of Charan-Po-Rantan say they're content in their own world. On latest album, "Futae no Rasen" ("Double Spiral"), the duo dwells on remaining inside this world — a place soundtracked by an accordion.

"I didn't play with friends (growing up) and was always in the closet with my accordion," 24-year-old Koharu Matsunaga tells The Japan Times. The instrument isn't a popular choice with many children, but she says she fell in love with it when she heard it at a circus at age 7. At age 15, she used it to start a band.

"The reason I kept playing was because the accordion can stand on its own," she says. "On one hand you play the accompaniment and on the other you play the melody."