Manga creator Mihona Fujii revealed on Monday that she will continue her GALS! manga on Shueisha's Manga Mee app on November 5. Fujii clarified that the new run is not a spinoff, but a continuation of the manga's original serialization.
Fujii serialized the manga's original run in Shueisha's Ribon magazine from 1998 to 2002, and Shueisha published 10 compiled book volumes for the manga. CMX Manga published all 10 volumes in English, and it described the first volume of the manga:
Self-styled Kogal queen Kotobuki Ran and her friends just wanna have fun, which includes shopping, hanging out, and scamming meals off gullible guys. Unfortunately, their 'hood' - Shibuya - is in constant danger of being despoiled by dirty old men, street gangs, nasty Kogal rivals, and other societal evils. But with a little help from her friends and a toughness born of coming from a family full of cops, Ran takes on the bad guys (and GALS!) with gusto!
The manga inspired the 52-episode Super GALS! television anime, which premiered in 2001. ADV Films released the series over six DVD volumes from 2003 to 2004, and then in two separate DVD collections in 2005 and 2007. Right Stuf released the entire series on DVD in 2010, and again in 2016. Crunchyroll added the anime in 2017.
Source: Mihona Fujii's Twitter account via Nijimen