Due to the ability called "Reversal," Flamm, who is even weaker than an ordinary person, is inexplicably chosen for the hero party by a divine revelation. Naturally, she was of no help in battle, but she worked hard to take care of everyone's needs and supported the party. However, the sage Gene, who found her presence annoying, continued to bully her and ultimately sold her off to a slave trader. In a world painted with despair, she comes into possession of a "Cursed Great Sword." This greatly "reverses" the fate of Flamm and the slave girl Milkit, whom she meets after being sold――