Makina, a blacksmith who worked in the renowned guild “Silver Wings,” is expelled from her guild. The reason? Guild members who don’t value their weapons believed it was more cost-effective to buy them rather than employ her services. Lost and uncertain about her future, Makina receives an invitation from her childhood friend and adventurer, Aria. She joins Aria’s guild, “Rainbow Butterflies.” It’s here that Makina’s blacksmithing talents truly shine. With her weapons in the hands of guild members, they collectively rise to become the mightiest of all.