The setting is China during the Song Dynasty. It is an era where warriors compete for supremacy in search of 100 of the strongest weapons across a vast and boundless land. The weapons recorded in the "Hyakudai-heiki-fu" (Book of the Top 100 Weapons) possess supernatural powers, and those who wield them, the "Jigousha" (Wielders), possess the martial might to defeat a thousand men and absolute power. Shin and Yue, twins whose father was brutally murdered in the conflict over these weapons, began their journey of revenge. Though Shin lost his own "Shinryoku" (Inner Strength) to protect his younger sister, he aims for the pinnacle of the "Book of the Top 100 Weapons," once held by their father, and fights, brandishing his silver spear.