CLAMP (Mangaka group)

"Kazuhiko is a young, but already deeply wounded black ops agent of a baroque, retro-tech future-- is pulled out of retirement to escort Sue, a mysterious waif, to a destination she alone knows. Sue and Kazuhiko have never met, yet she knows him, having grown up since the age of four with her only human contact being two distant voices: that of her elderly 'grandma'-- Kazuhiko's commander, General Ko, and of Kazuhiko's dead girlfriend, the beautiful...

"The beautiful new teacher in Sakura's class, Kaho Mizuki, soon reveals that she's a shrine maiden with magic powers of her own. But as always, the struggle to capture the Clow cards is woven together with the mysterious-- and complicated-- threads of love and affection between Sakura and all the people in her life. Will her heart be strong enough as she faces the one who will judge her worthiness to master the cards at last?"--P. [4] of cover.

Watanuki Kimihira is haunted by visions of ghosts and spirits. By chance, a mysterious witch named Yuko claims she can help. In desperation, he accepts but realizes he's just been tricked into working for Yuko.