Kyrie Eleison, a young man living in a world where the legendary hero Requiem once saved humanity from destruction, dreams of becoming a great adventurer. However, he is ridiculed for his lack of talent and his resemblance to Requiem, who is revered as a savior. When Kyrie encounters a mysterious girl named Ely, who claims to be the last surviving member of Requiem’s party, his life takes a dramatic turn. Ely reveals that she has been searching for someone worthy of wielding Requiem’s sword, Excalibur, and believes Kyrie may be that person.

Together, Kyrie and Ely embark on a journey to uncover the truth behind Requiem’s legacy and the world’s impending doom. Along the way, they are joined by other companions, including the dragon girl Ruca and the warrior Albert, each with their own motivations and connections to the past. As they travel, the group faces numerous challenges, including powerful enemies, ancient secrets, and the lingering influence of Requiem’s actions. The narrative explores themes of heroism, legacy, and the burden of living up to expectations, as Kyrie struggles to define his own path while carrying the weight of Requiem’s shadow.

The story is set in a richly detailed fantasy world filled with magic, mythical creatures, and remnants of a bygone era. The plot intertwines Kyrie’s personal growth with the larger mystery of Requiem’s true intentions and the fate of the world. As the group delves deeper into their quest, they uncover hidden truths about the hero’s past and the sacrifices made to protect humanity. The series balances action, adventure, and emotional depth, creating a compelling narrative that keeps readers engaged. The characters’ interactions and development are central to the story, with each member of the party contributing to the unfolding events and the resolution of the overarching conflict.