The tale of the Shepherd, a savior who will bring peace to the seraphim and human worlds, becomes Sorey's reality after a fateful encounter.

Sorey is a human youth who grew up among the seraphim, spiritual beings not visible to humans. Sorey believes in the folklore that says "long ago, every human was able to see the seraphim" and dreams of unraveling the ancient mystery to make the world a place where people and seraphim can live together in peace. One day, Sorey visits the human capital for the very first time. He becomes embroiled in an incident during which he pulls out a holy sword embedded in a rock and ends up becoming a Shepherd, one who casts away calamity from the world. He begins to realize the gravity of his mission, and his dream of coexistence between mankind and the seraphim becomes more intense and thus, the Shepherd embarks on an amazing journey with his companions.

From way back, people worshiped Seraphs as Gods. Seraphs are beings that are able to use magic, however, they have always been among people. Yet, only a few are able to see them, those who can leave their names and legacies in the history of the mankind. Sorey, the main protagonist of the series, is a human raised by the Seraphs. Long-long time ago, Shepherds, humans contracted to a powerful Seraph, were that only power keeping peace and all terrors of wars away from the humanity. They are no more, so the world sinks in malevolence. Sorey having saved the princess, finds out that the humanity is in grave danger yet again. He together with his friend Mikleo and the princess Alisha embarks on a quest to save the mankind.—Scientiiaa