Mahoutsukai Syd & Lid

From Storm in Heaven:

Magicians, people with magical powers that have caused their kind to be hated and feared throughout the centuries. This manga contains their tales -- of magic for both good and evil, the struggle to fit into society, and a dark past that haunts them both.

The series includes:

1) Romanesque Variee
2) Mystic Variee
3) Classical Variee
4) Sweet Variee
5) Silouette Variee
6) Crescent Variee
7) Secret Variee
8) Fantastic Variee
9) Nostalgic Variee