Gals

Gals! is a shōjo manga written by mangaka Mihona Fujii. The manga was serialized in Ribon and published in the U.S. by CMX.

The series revolves around the kogal (also known as "gal") subculture in Japan. The title character, Ran Kotobuki (Kotobuki Ran in the English manga: CMX uses Japanese order while ADV uses Western order), is the self-proclaimed "world's greatest gal." As a teenager in Shibuya, she's determined to live out the gal lifestyle for the rest of her life, and she has gained a reputation as the most respected gal in all of Shibuya. However, she comes from a family of police officers - her grandparents, her parents, and her older brother are all officers, and her younger sister is set on following in their footsteps. Only Ran has other dreams, but even she has acquired their sense of justice and spirit.

But the show doesn't always show Ran's point of view. It really consists of teenagers who live the same life as regular students and kogals in Japan. There's romance, troubles, and insecurities, especially Miyu and Aya's (since they take their relationships more seriously than Ran).

As a result of its reference to this lifestyle, ADV has given the series a 15+ rating (since many Americans unfamiliar with Japanese culture might see the lifestyle, especially the part of it pertaining to "enjo kōsai" as nothing more than prostitution, which is illegal in Japan).

Source: Wikipedia