In the quaint village of "Hinomura," a spirited young girl named Yuuna defied the conventional expectations of her time. Uninterested in the pursuits deemed suitable for girls, Yuuna harbored a deep fascination for combat and spiritual activities, much to the bewilderment of her fellow villagers. Her days were filled with clandestine training sessions, honing her skills in anticipation of an unknown destiny.

One fateful day shattered the tranquility of Hinomura as a mysterious group descended upon the village, leaving chaos and destruction in their wake. The once vibrant community was reduced to ashes, and Yuuna's world crumbled as she witnessed the unthinkable—her entire family and fellow villagers mercilessly taken from her. Miraculously, she managed to escape the devastation, her heart heavy with grief, survivor's guilt, and an unquenchable thirst for retribution.

Seeking refuge in the solemn heights of "Yamagiri," a majestic mountain that stood as a silent witness to the unfolding tragedies, Yuuna's cries of anguish reached the divine ears of the gods. Touched by her resilience and burdened soul, the gods bestowed upon her a weapon of extraordinary power—the Sorrowblade. Crafted from the essence of sorrow itself, this divine sword possessed the ability to absorb the souls of fallen adversaries and, in turn, wield the power to revive those lost to the cruel hands of fate.

Now armed with the Sorrowblade, Yuuna's journey unfolds as she navigates through treacherous landscapes, facing the unknown forces that decimated her village. Her quest is not only for vengeance but to restore balance to a world teetering on the edge of despair. As she battles through adversity, the echoes of her fallen loved ones guide her, and the divine gift of the Sorrowblade becomes both a symbol of her grief and a beacon of hope for the restoration of life and harmony.