Dengeki Comic Gao!
The manga was written and illustrated by Yu Yagami. It was serialized by MediaWorks in the manga magazine "Dengeki Comic Gao!" from June 1995 to March 2003, and collected in 21 bound volumes. It is licensed in English by ADV Manga, with only the first seven volumes published in English in 2004, before the series went on indefinite hiatus. ADV's website makes no mention of the series in manga form, so it is unlikely the series will be continued.