

Though relatively few of Maruo's manga have been published outside of Japan, his work enjoys a cult following abroad. Some of his characters have been made into figures as well.

Though most prominently known for his work as a manga artist, Maruo has also produced illustrations for concert posters, CD Jackets, magazines, novels, and various other media. When photographed, he seldom appears without his trademark sunglasses. Like many manga artists, Maruo sometimes makes cameo appearances in his own stories. Maruo was a frequent contributor to the legendary underground manga magazine Garo. Two years later, his first stand-alone anthology, Barairo no Kaibutsu (Rose Colored Monster) was published. It was at this stage that the young artist was finally able to pursue his artistic vision without such stringent restrictions over the visual content of his work. Maruo temporarily removed himself from manga until November of 1980 when he made his official debut as a manga artist in Ribon no Kishi at the age of 24. At 17, he made his first manga submission to Shonen Jump, but it was considered by the editors to be too graphic for the weekly magazine's format and was subsequently rejected. At the age of 15 he moved to Tokyo and began working for a bookbinder. Maruo graduated from junior high school in March of 1972 but dropped out of senior high school.
