
The legend of the Four Dragons and the origin of the land has been passed down for generations in the land of Kouka. Currently, Hiryuu Palace has no one else next in line for the throne other than the fifteen year old princess, Yona, who had been raised with care. Finally, the night of her sixteenth birthday arrives. She expects it to be a wonderful day spent with her peace-loving father, Il, her servant and friend Hak, and her cousin Soo-won, who she had feelings for... However... That night, Yona goes to visit her father to tell him how she really feels, because he opposes to her getting married to Soo-won. However, when she gets to her room, she encounters a shocking truth. The destinies of Yona and the Four Dragons entwine in this period drama fantasy romance!

Shiina Kokomi is a hard working but even tempered high school girl who is the lead performer in her school's rhythmic gymnastics club. The story follows her and her growing circle of friends as they support each other through the various trials and situations that comprise high school life.

Due to the long war, the Muromachi shogunate gradually declined. The world has entered the secret realm of mountains and seas during the Warring States Period, which advocated blood debt and blood repayment. Deep in the dense forest of the Kingdom of Nori, there is a gun group with the Yatagarasu as its military flag and emblem. They work as mercenaries and gallop on the battlefield, and their name is "Zahe Zhong". The person who inherited the title of leader of the Zahe clan was named Sun Yi, and he was a young man who drifted here from a foreign country. On the other side, Saburo, who was the first to notice the aggressive intentions of European powers, was running around to protect Japan. The two people who had nothing in common first became connected due to the attack of foreign invaders. How will this group of men in the Warring States Period implement their beliefs and justice. Their story officially begins——!