Regis is an unconventional soldier—helpless with sword and bow, finding comfort in books instead of battle. Assigned to a remote region, he encounters Altina, a striking princess with crimson eyes and scarlet hair who wields the supreme ruler's sword. Despite her youth of fourteen years, she commands the area's armies as the Emperor's illegitimate child. Rather than despair, Altina pursues her dreams with fierce determination. «I trust you,» she tells Regis, appointing him as her strategist. Together they face formidable obstacles in this military fantasy—a tale of a book-loving tactician and a young warrior princess united by mutual trust and shared purpose.