13 books in series

Eden: It's an Endless World!

Eden: It's an Endless World! is a 13-book series with 13 released primary works first released in 1998 with contributions by Hiroki Endo.

Eden: It's an Endless World, Volume 1 (Eden: It's an Endless World, #1)
Eden: It's an Endless World, Volume 2
Eden: It's an Endless World, Volume 3
Eden
Eden: It's an Endless World, Volume 10
Eden: It's an Endless World, Volume 11
Eden: It's an Endless World, Volume 12
Eden: It's an Endless World!, Bd. 13
Eden: It's an Endless World!, Bd. 14
Eden: It's an Endless World!, Bd. 15
Eden: It's an Endless World!, Bd. 16
Eden: It's an Endless World!, Bd. 17
Eden: It's an Endless World!, Bd. 18