They are based on the light novel series of the same name, written by Shoji Gatoh and illustrated by Shiki Douji, using material from the first three novels (Fighting Boy Meets Girl, Running One Night Stand, and Into the Blue) of the series over 24 episodes.

The series focuses on Sousuke Sagara, a Sergeant from the mercenary group Mithril who is assigned to enroll into a Japanese high school to protect Kaname Chidori, a student with a special gift.

The first season began in Japan, on January 8, 2002, and ended on June 18, 2002.

was "tomorrow", while its ending theme song was "Never Dying Flower" (枯れない花, Karenai Hana), both performed by Mikuni Shimokawa.

For the North American release, the series was licensed by ADV Films.