"Goulart Knights" is set in a medieval fantasy world where humanity is under constant threat from monstrous creatures known as Goularts. These creatures emerge from a mysterious rift, spreading chaos and destruction. To combat this threat, an elite order of warriors, the Goulart Knights, is established. These knights wield ancient relics called Arma, powerful weapons imbued with the ability to harness elemental forces and slay Goularts. The story centers on a young knight named Ryn, who joins the order after his village is destroyed by a Goulart attack. Ryn is driven by a desire for vengeance and a determination to protect others from suffering the same fate.

The narrative unfolds as Ryn trains alongside fellow knights, each with their own motivations and tragic pasts. Among them is Liora, a skilled and disciplined warrior haunted by the loss of her family, and Kael, a charismatic but reckless fighter with a hidden agenda. The group is led by Commander Aldric, a seasoned veteran who serves as both mentor and strategist. As the knights undertake missions to defend humanity, they uncover a deeper conspiracy involving the origins of the Goularts and the true purpose of the Arma. The relics, it is revealed, are tied to an ancient civilization that once thrived before its downfall, and their misuse could lead to catastrophic consequences.

The plot intensifies as internal conflicts arise within the order, with some knights questioning the morality of their actions and others seeking to exploit the Arma for personal gain. Ryn and his companions must navigate these tensions while facing increasingly powerful Goularts, including sentient beings who challenge their understanding of the enemy. The story explores themes of sacrifice, loyalty, and the blurred line between humanity and monstrosity. As the knights delve deeper into the mystery of the rift, they confront not only external threats but also their own inner demons, culminating in a climactic battle that will determine the fate of their world.