2 girls meet after long. One has become a GAL = "Gal" is the English transliteration for gyaru, which is a fashion trend in Japanese culture. This fashion trend includes things like:
Tanning/darkening the skin
Wearing lots of shiny makeup (traditional Japanese culture is very modest with makeup)
Wearing lots of jewelry and has lots of accessories (fake nails, excessive nail/toe polish)
My Angel Childhood Friend Was A Gal When We Met Again