"Arifureta Zero" serves as a prequel to the main "Arifureta" series, delving into the events that transpired centuries before the original story. The narrative centers on Oscar Orcus, a brilliant but frail scholar, and Miledi Reisen, a spirited and powerful mage. Together, they form the foundation of the Liberators, a group dedicated to opposing the tyrannical rule of the gods who have subjugated humanity. The gods, known as the Apostles, exploit humans for their own gain, and the Liberators aim to dismantle their oppressive system.

Oscar, despite his lack of physical strength, possesses unparalleled intellect and ingenuity, creating advanced artifacts and weapons that become crucial to the Liberators' cause. Miledi, on the other hand, is a prodigious mage with immense magical prowess, driven by a strong sense of justice and a desire to protect the weak. Their partnership is marked by a blend of mutual respect and contrasting personalities, with Oscar's calm, analytical demeanor balancing Miledi's fiery and impulsive nature.

The story explores the formation and growth of the Liberators as they recruit other key members, each bringing unique abilities and perspectives to the group. Among them are Naiz Gruen, a stoic warrior with a tragic past, and Lyutillis, a cunning and resourceful strategist. Together, they embark on missions to undermine the gods' influence, liberate oppressed populations, and uncover the truth behind the divine hierarchy. Their efforts are met with fierce resistance from the Apostles and their loyal followers, leading to intense battles and strategic confrontations.

As the Liberators gain momentum, internal conflicts and moral dilemmas arise, testing their resolve and unity. The narrative delves into themes of sacrifice, loyalty, and the cost of rebellion, as the characters grapple with the consequences of their actions. The gods, portrayed as enigmatic and merciless, present a formidable challenge, with their true motives and the extent of their power remaining shrouded in mystery.

"Arifureta Zero" provides a deeper understanding of the world-building and historical context of the "Arifureta" universe, offering insights into the origins of key elements and factions that play significant roles in the main series. The prequel enriches the overarching narrative by highlighting the struggles and triumphs of those who laid the groundwork for the eventual rebellion against divine tyranny.