A samurai walks into a dying city to fix what politicians broke, armed with nothing but a bow and the knowledge that one cursed gem might save everyone or destroy them faster. The show treats 10th-century Kyoto like a real place that stinks and suffers, not a backdrop for heroics. Minamoto no Raiko isn't chosen because he's special; he's sent because he's the only one left who actually cares whether the city lives or dies. Every curse he breaks reveals another layer of corruption eating Kyoto from inside. The gem isn't a MacGuffin. It's a mirror held up to a system so rotten that salvation might look indistinguishable from catastrophe.

In 972 A.D., Kyoto is decaying: famine and disease spread while samurai and onmyoji scramble for political power. The Imperial Court orders Minamoto no Raiko, a samurai famed for his archery, to recover a legendary gem said to hold the power to save the world. When Raiko falls ill himself, his youngest sister Hikaru secretly takes the journey in his place, meeting many people and facing many adventures along the way. The show is a Heian-era fantasy adventure with drama and supernatural elements.