X/1999 (X) by CLAMP
Following the death of his mother and a prophecy, Kamui returns to Tokyo seeking the means by which to change the fate of the world as armageddon is fast approaching. Two supernatural factions vie for control over the world’s destiny, both seeking the power of Kamui to reach their ultimate goals. And thus fights for power erupt all over Tokyo as Kamui is torn between friendship and the power to change the course of the Earth’s future.
A large cast makes up this epic as CLAMP interweaves the desperate battle for Earth with the relationships and personal stories of all involved. There is always someone new and interesting just around the corner, sometimes literally, in this story but be prepared to say goodbye to quite a few of them because death and destruction are present at every turn.
Everyone has their favorite CLAMP work and this is mine. I much prefer their earlier series where the art feels more tactical and less perfect.
This is a prime time to pick up X/1999 and enjoy all 18 volumes of beautiful art since VIZ has started releasing fantastic oversized omnibus editions which include color inserts.
As the years go by it becomes less and less likely that X/1999 will ever receive an ending in manga form. They should really consider doing it as a doujinshi!