While venturing through Labyrinthos, Makoto Takatsuki and his party are attacked by a dragon and sent tumbling into the dungeon's inner depths. But just when all hope of escape seems lost, Makoto miraculously reunites with his former classmate Aya Sasaki—who's reincarnated as a lamia! Aya recounts her harrowing rebirth and the tragedy that befell her lamia family at the hands of the harpies. She's sworn vengeance upon the whole harpy flock, including their loathsome calamity class queen. And as an RPG and boss battle aficionado, Makoto is all too happy to lend an old friend a hand Now he'll have to rally his party and prepare an infallible counterstrike, but the harpy queen may have an unforeseen and devastating ability in her arsenal... Hardcore mode is about to get even harder! Can Makoto optimize his party's skills to beat this deadly boss?