Fuujin Year 130 (Medieval times when magic and gods were of great importance). Two years ago, the great war in the "Old Fuujin Continent" was controlled by the "Zenon Country" who possessed great power. In Randia, a small country to the south, the young prince Alfred is attacked by an assassin but gets saved by his friend Welles. The young prince was the last key to the revival of Randia... It was said that in legends the prince had the power to unleash the "Seal of Power" because of his blood relation. This brought fear upon the Zenon country and thus their attack. Welles was just another soldier, but he was also a close friend of Alfred's and they had been fighting together in the battlefield for a long time. That is why they're known as the "Galloping Winds" on the battlefield. And so, the two of them along with Welles' younger sister Teefa, are burdened with the fight for their country. Hearing that war is once again about to break out, the former loyal subject Rea also returns. As more and more people get involved in the war, the mystery of the seal unfolds... To reveal the "Blood Relation of the Prince"...

Set during the Heian Period, Kyo is a beautiful city that is proud of its glory. Two beautiful onmyouji meet, and the sad and short-lived beautiful cherry blossom starts to stir after 1000 years.

In the world of Neverland, humans and monsters live alongside each other. Generation of Chaos details the start of the adventures of the two heroes of Neverland, Chiffon and Roze. Departure of Chiffon Chiffon is a boy with the power to train monsters. After realizing that his power is waning, he sets out to Hiyoko Forest to return his Hiyokomushi—a fish-like mount and companion—back to its homeland, the Hiyoko Forest. However, the journey there is anything but uneventful as his control over his monster gradually loosens. Roze's Decision Roze is of half-demon descent, living a quiet life among humans with her sister Emilia. One day, as Roze returns from work, she sees her house being set on fire.The destruction of her home shatters her dream of being able to live peacefully with humankind, as she is reminded that harmony between demons and humans is far from becoming a reality.

The characters from previous .hack//G.U. Games and .hack//Roots receive an email from Ovan. He is requesting them to go to Hidden Forbidden Festival where is set up a mysterious summer festival. There they find an AIDA Chim Chim who wishes to peacefully co-exist with the other players of The World. It then transforms into the word "Returner", so they assume it to mean that Ovan will return to The World.