Having finally found a way home, Hajime and his party head to the final labyrinth—the Frost Caverns. There, in that frigid land, the party seeks out the last ancient magic they'll need to go back to Earth. Upon entering the caverns, a maze of ice and an ever-present sinister whispering chips away at their concentration. As they proceed through it, the party is split up. Separated from the others, Shizuku is forced to fight a copy of herself. Will she be able to overcome this trial and surpass her limits?