In the depths of the enigmatic subterranean maze called 'Tartaros,' brave adventurers tirelessly seek treasures and wealth. Among them is novice explorer Rabi, who, unfortunate in his endeavors, encounters a peculiar half-beast named Philo. Striking a deal, Rabi engages Philo as his loyal client. What twists await Rabi in his journey? Will he persist in purchasing items from this charming yet quirky companion?