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!

In a world consisting of numerous isles, a young hero from the Astora Isle encounters the adventurer Kyle and follows him on an expedition on the isle. They meet a mysterious girl named Iris and a talking white cat, and together they make their way to the isle's ruins, where they find a flying island. Kyle becomes consumed by darkness there, and the party resolves to travel to the ends of the world on the flying island in order to find the seven "Great Runes", following Kyle's words before he disappeared.

Immediately following the events of "Ikki tousen: Xtreme Xecutor", the kids from Nanyo Academy head to Kyoto for a school trip. Before long, they run into rival classmates from other Kanto schools and find themselves confronted by Kyoto's best fighters. It's a battle of epic proportions. Hopefully the city of Kyoto will be left standing!

In the Kanto region of Japan, seven high schools take place in a turf war for territorial supremacy: Nanyo Academy, Kyosho Academy, Seito Academy, Yoshu Academy, Rakuyo High School, Gogun High School, and Yoshu Private School. The fighters of each school bear the sacred jewels called magatama, which contains the essence of warriors from the Three Kingdoms era of Ancient China 1800 years ago, as well as their fates.