In a world where malevolent Shades threaten humanity, young Kaito Kazehaya embarks on a perilous journey to become a Vanguard, driven by a personal vendetta. Trained by the legendary Ryujin, Kaito must confront his darkest fears to save his sister from a curse and protect his world from the rising shadows. As he battles powerful enemies and uncovers ancient secrets, Kaito learns that the path to becoming a true warrior is fraught with sacrifice, loyalty, and the strength to overcome even the most overwhelming odds.