Our Last Crusade or the Rise of a New World, Vol. 15 (light novel‪)‬

A CRUSADE UNFULFILLEDThe invasion of Omen has been thwarted, and three of the Sovereignty’s princesses have joined forces with the Empire. But as everyone decides how to deal with Elletear and the calamity, Queen Mirabella hesitates to lend aid. To face the truth, she asks Sisbell to use Illumination to re-create the events from thirty years ago. They see a young Mirabella who cared only for battle, shirking her royal duties and connections with others to indulge in her obsession with combat. That all changed, however, when she met Salinger, the infamous transcendental sorcerer and the only person capable of challenging her. This is the tale of what blossomed between two unlikely rivals, pushing each other to be better—until tragedy ripped it all away.