Alice Quartet or AQ for short, is a fashion
firm that includes the custom clothing lines of four designers. All four work only in black and white, but in no other way have anything in common.

Makino, known as Makinon, at 24 is the leader of the group and the designer of "Le Croix de Lune," specializing in frilly, goth-loli-esque dresses.

Yuuki, still in high school, does the very butchy, yet somehow feminine "Aqua Drop" line.

Uber-cute Suika, known as Su-chan, designs cute activewear line "P's."

And last, Fumi, who you may remember from Iono-sama, receives her direction from Maria-sama for her "Saya" line which blends classic Japanese and Western concepts.

The AQ store is owned by Yukino, called Yukinon, a former classmate of Makino's, a childhood friend and now business partner.

(http://okazu.blogspot.com/2009/01/alice-quartet-obbligato-manga.html)