Having finally found a way home, Hajime and his party head to the final labyrinth--the Frost Caverns. Its frigid depths hold the last ancient magic they need to return to Earth, but upon entering the caverns, a strange presence unsettles the party and splits them up, and they become lost in a maze of ice. 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?