Xibalba

is a Japanese light novel series written by Sami Shinosaki. The series began publication on August 10, 1996 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
21st century America. Ishlanka, a girl who suddenly appears in front of Ayre-Swiet, a boy who pretends to be a street kid. She argues that Ayre's "secret stone" is needed to protect the "sealer." However, the two are attacked by a mysterious group aiming for the same "secret stone"! When the four secret stones are gathered, the door to the dark kingdom opens-can Aire and others prevent this? Aire gets caught up in the battle of the gods without having time to do it ... A new adventure fantasy based on Maya mythology presented by the combination of Shinozaki and Kimura is about to begin.