Most volumes published by a duo of authors for a single comic book series (female)

The most volumes published by a duo of authors for a single comic book series (female) is 100 and was achieved by Mayumi Muroyama and Mariko Muroyama (both Japan) with their comic book series "Asari chan", published from 25 May 1980 to 5 March 2014. Mayumi Muroyama and Mariko Muroyama are sisters and have collaborated to write and publish Asari chan under a collective name of "Mayumi Muroyama". 28,000,000 books in total have been published by Shogakukan Inc. as of June 2014. The duo started writing the series in 1978 and the first volume was published on 25 May 1980. Asari-chan is a Japanese shoujo (girl) slice of life manga series. The comic book series follows Asari, a normal but somewhat unusual elementary school fourth-grade girl who does not get along with her family.