Kiyotaka Narumi, a world-class detective, has been missing for two years. His last words prior to his mysterious disappearance were "I'm going to uncover the mystery of the Blade Children." These words have haunted Kiyotaka's younger brother Ayumu ever since, but neither he nor anyone else has gotten any closer to figuring out their meaning. But after Ayumu becomes the prime suspect in a murder, he begins to discover people with links to the 'Blade Children' all around him! Following in his brother's footsteps, Ayumu now must begin his own investigation into the mysterious Blade Children...
If you like a convuluted plot and interesting characters each with their own goals and dreams then both of these are good reads. They're by the same author and you can tell by how the plot keeps moving and changing.
In the year 1999, Tokyo has become a battleground as the Seven Dragons of Earth and the Seven Dragons of Heaven fight to determine the fate of the world. The one with the power to decide which way the battle will go is a youth named Kamui Shirou. Will he join the Dragons of Earth and preserve the planet by ending human life, or become a Dragon of Heaven and protect humanity from ruin? The fate of all mankind lies on Kamui's unwilling shoulders as both sides clash to gain dominance. The Dragons on both sides are individuals gifted with superpowers and fated to participate in this final battle, but what end will Kamui choose?
Both of the series involve an end of the world of some sort and people fighting against it. Despite numerous action scenes x/1999 and Record of Fallen Vampire are still deeply emotional. What I personally like about both of the series is that there are no real "evil" characters. Each character has his/her own background, personal tragedies and reason for the path he takes. If you liked one, you will like the other.