Fate Graphite has never tasted true power. Born into a world with two kinds of people—those with superior skills and those without—he's been shunned his entire life. Fate's skill is Gluttony, a curse that leaves him constantly hungry... until he awakens its terrible potential. When he kills someone, he can devour their skills and feed his insatiable appetite. How many lives will it take for Fate's Gluttony to finally be satisfied?

Having discovered the true power of his Gluttony skill, Fate Graphite has taken his first step toward becoming a warrior. Now he works as a servant in the home of Roxy Hart by day... and hunts monsters to satisfy his appetite by night. But the corpses left in his wake have sparked rumors of a lich on the loose. When Fate learns that his former tormentor, Hado Vlerick, seeks to slay his alter ego, this weakling-turned-warrior hatches a plan for revenge.

Fate's plan to support Roxy takes a sudden turn when enemies among her fellow holy knights send her on a mission that might as well be a death sentence. Hating his helplessness and hungry for revenge, Fate follows Roxy to the front lines to protect her... but not before resolving to devour those responsible!

Fate is headed to Galia, where mighty monsters and a reunion with Roxy await. He's joined by a mysterious woman who also possesses a deadly skill—Wrath. For the first time in his life, Fate has an ally to fight beside him. But will this be enough to survive against his increasingly formidable foes? Or will Fate's ever-growing hunger finally consume him?

Fate has arrived in monster-infested Galia. But before he can continue to Babylon, the sentinel city where Lady Roxy is stationed, he must first fulfill his promise to Myne by putting down a powerful, ancient weapon. Then, just when he finally reaches his destination, Fate runs afoul another mysterious woman, Eris, who confronts him with a terrible truth!

Determined to protect Roxy from a plot to sacrifice her, Fate joins the battle to defend Babylon against a stampede of monsters. But his mission is complicated by the appearance of a masked man wielding a Weapon of Mortal Sin. Can Fate keep both Roxy and himself alive, all while hiding his true identity from her?

To rescue Roxy, Fate pushed his Skill of Mortal Sin to its very limit, only narrowly defeating Envy and the Divine Dragon. But he paid dearly for it, losing both his arm and control over Gluttony, forcing Roxy to save him instead. Now a new path lies ahead, one that leads back to some familiar foes!

Back in Seifort after his travels in Galia, Fate runs afoul of his former tormenter, Rafale Vlerick, who reveals a plan to bring the world's skill-based hierarchy to a swift and violent end. But when Rafale's own power consumes him, it's up to Fate to stop an army of vampiric monsters from swarming the city!

His connection to the Vlerick family severed, Fate returns to the royal capital hoping for a peaceful time, but he and Roxy are soon lured out to a nearby forest. There, they fall into an ancient monster's trap that switches Fate and Roxy's bodies! Sealed in Fate's body and subject to Gluttony, Roxy faces death by starvation, while Fate is powerless! How will they survive the spell, and if they do, can they withstand the monster?

The military force sent to Galia—and supposedly killed by the Divine Dragon—makes a sudden return to the royal capital. Among them is Mason Hart, Roxy's father. Roxy and Fate are shocked and confused but joyful to have him back. Meanwhile, Fate receives a report from Laine about the Elder Stone—a fragment of Shin. When an explosion hits the military district, where the mysteries behind the resurrected dead and the Elder Stone intersect, Fate encounters the last person he expects to see!