Mayumi Muroyama

Mayumi Muroyama (室山まゆみ) is the joint penname of Japanese manga artists Mayumi Muroyama (室山真弓) and her younger sister Mariko Muroyama (室山真里子). They made their professional debut in 1976 with Ganbare Aneko in Shoujo Comic.

In 1977, Muroyama began publishing the long-running Asari-chan, which is collected in 76 volumes and which has sold 26,500,000 volumes total as of May 2006, making it the seventh best-selling shōjo manga ever in Japan. Asari-chan received the 1986 Shogakukan Manga Award for children's manga. Several of Muroyama's manga have been adapted as anime, including Asari-chan as both a television series and theatrical movie, Dororonpa! as a television series, and Mr. Pen Pen as a television special.