―The Royal Capital, Granvania. The world's largest magical nation. At its heart stands the Royal Granvania Academy of Magic, which was now welcoming new students on the day of the entrance ceremony. The vast, white-walled school buildings. Magical airships crisscross the sky, and on the training grounds, senior students clad in vibrantly colored Magical Armor engage in mock battles. Dragons, wolves, lions, phoenixes... Each student wielded their own unique Magical Armor, housing the power of the magical beast they had contracted with, aspiring to become knights of the future. Amidst this bustle, a young man with silver hair makes his way toward the academy's main gate. The fallen great nation, Arcadia. The Dragon Kingdom that vanished from the world fifteen years ago. Few know its name, and history records that there are no survivors. But that history was a lie. At the young man's chest, a jet-black Magical Core, invisible to all others, pulses quietly. The legendary Black Dragon King, Bahamut. The mightiest Magical Armor, passed down only to the successive kings of Arcadia. Its power still awaits its master, even now. '...It has been a long time, the world of men.' A low, dignified voice echoes directly into the young man's consciousness. 'Be careful. There are those in this academy who know of our power.' As the Black Dragon King's words fade, the academy's massive bell rings out loudly. Gong... "New students, this way, please!" A guiding teacher raises their voice, and many new students begin walking toward the auditorium. Along the way, a girl with flowing, pale blonde hair stops amidst the crowd. Her deep, clear blue eyes turn toward the silver-haired young man. The Second Princess of the Kingdom of Granvania—Cynthia Granvania. "...Huh?" She places a hand on her chest and gazes at the young man curiously. They should be meeting for the first time, yet he feels somehow nostalgic. A strange sensation, as if she had known him from a distant past. However, that sense of incongruity is soon swallowed by the wave of people. In the auditorium, Headmaster Selicius Arcaman and King Altrius Granvania are preparing to welcome the students who will shoulder a new era. And no one knows. That on this day, the enrollment of a single young man will begin to greatly stir the truth of the fallen Arcadia and the fate of the world... Now, the story begins here.