Sei Michaela Gakuen Hyouryuuki (Light Novel)

is a Japanese light novel series written by Ei Takatori, with illustrations by Yu Kinutani. The series began publication on September 10, 1994 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
Reborn as a woman named Aiko, the soldier rises as the military leader of a new crusade, successfully unites the world and abolishes all religion. Haunted by memories of a past life, Aiko travels backwards in time, and finds herself caught in an incredible battle to save the future.