11 books in series

X/1999 (X [エックス])

X/1999 (X [エックス]) is a 12-book series with 11 released primary works first released in 1992 with contributions by CLAMP and Fred Burke.

X/1999, Volume 02: Overture
X/1999, Volume 04: Intermezzo
X/1999, Volume 06: Duet
X/1999, Volume 07: Rhapsody
X/1999, Volume 10: Fugue
X/1999, Volume 12: Movement
X/1999, Volume 13: Lament
X/1999, Volume 15: Waltz
X/1999, Volume 16: Nocturne
X/1999, Volume 17: Suite
X/1999, Volume 18: Inversion
X/1999, Volume 18.5