Kagura is a samurai girl revered as the Sword Saint for her unmatched mastery of the blade. Raito is a boy of the Nin'you, a race of human-like beings despised and feared by human society. The two met in childhood and formed a deep, inseparable bond as best friends, spending their days together in happiness despite the growing tension between their kinds. That bond was shattered when the difference in their races forced them apart, and the world's prejudice and hostility drove a wedge between them. Years later, Kagura takes up her sword once more, not for glory or duty, but for Raito. Her singular vow is to live together with him, no matter what stands in their way. Their journey carries them across a fantastical landscape that blends Japanese and Western elements, where they confront the walls built by fear, hatred, and the passage of time. The central narrative follows Kagura and Raito as they fight to reunite and carve out a place where they can coexist, challenging the very reality that seeks to keep them apart. The story weaves together action, adventure, and supernatural conflict with a deeply personal bond that transcends the boundaries of race, society, and even the nature of existence itself.