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Mayumi Muroyama
室山まゆみ
About
Muroyama Mayumi (室山まゆみ) is the joint penname of Japanese manga artists Muroyama Mayumi (室山真弓, born 1955-08-30) and her younger sister Muroyama Mariko (室山真里子, born 1957-09-27). They made their professional debut in 1976 with Ganbare Aneko in Shoujo Comic.
(Source: Wikipedia)