A bank teller discovers he is actually a background player in an open-world video game, and decides to become the hero of his own story. Now, in a world where there are no limits, he is determined to be the guy who saves his world his way before it's too late.
With King Uther's sudden death, chaos threatens to engulf Britain. The sorcerer Merlin has visions of a dark future and installs young and impetuous Arthur, Uther's unknown son and heir raised as a commoner, as the new king. The two install themselves in Castle Camelot with their allies, which include Arthur's biological mother, his foster brother, and a quartet of loyal warriors. From Camelot, Arthur tries to build a new and better Britain, where people can live in peace. Meanwhile, Arthur's cold half-sister Morgan plots to take the crown from him. Banished by Uther, who was responsible for her mother's murder to put Arthur's mother on the throne, Morgan is responsible for Uther's death and wants to rule as his successor. Aided by her loyal maid Vivian and the devious nun Sybil, Morgan takes up residence in Castle Pendragon, from where she schemes against Arthur.
Ning Yi, a determined woman from a cold background, grows through poetry, business, and martial arts, taking on increasing responsibilities and, with the help of her friends and family, using courage and wisdom to protect Lin An.
The story is set in an ancient time, when the whole country was covered in thick forests. A mysterious plague breaks out, resulting in countless deaths. A pure young man named Yoshihiko becomes chosen as a hero, and he sets out on a journey in order to save a village. He has two goals – to bring back the legendary plant that can cure the plague, and to rescue his father Teruhiko who left to find the plant but never returned.
