The Kingdoms of Dolhr, Grust, and Gra band together to wage war on the rest of the continent Archanea and defeat the Kingdom of Altea. King Cornelius is slain in battle but his son Prince Marth is able to escape the invasion thanks to the sacrifice of his older sister Elice. He and a small group of retainers find refuge on the island nation of Talys, where they spend the next three years in hiding under the royal family's protection. Marth lives a peaceful life in Talys, enjoying the beauty of the island and the friendship of its pegasus-riding princess, Caeda. But he is uneasy, knowing soon the day will come that he must take up arms. That day arrives when Caeda comes to Marth and his retainers in a panic, telling him that the castle town has been attacked. After some close calls, they manage to defeat the assailants and save the city. Realizing that his presence may bring further danger to his new home, Marth decides that now is the time to set off. He journeys to raise an army with which to reclaim his kingdom.

Shun Asanaga is a 15-year-old junior high school student with an optimistic and bright personality. One day, he finds a mysterious crystal in the office of his father, who is a scientist and businessman. When Shun touches it, the world becomes distorted, and he is sent into the world of Endra. Emilio, a prince of the kingdom of Endra, is nearing his 16th birthday and despises the reigning king, Delzain. Since Emilio is now at the age when he can inherit the throne, he takes up a weapon and attempts revenge. However, because Emilio is too weak, he is captured by Delzain and put in prison. When Emilio is in grief, the wall of his cell becomes distorted and Shun appears from there with two goals: return to his own world, and complete Emilio's revenge. What future lies ahead for the two boys trying to survive in Endra, yet raised in two different worlds?

On the vivid and glistening waters of the Kanda River, Jetters and their respective Shooters race together on their jet skis, speeding through the wind as they participate in Jet Races—"the world's most intense aquatic sport!" Chasing her dream of becoming a professional Jet Racer like her mother, Rin Namiki transfers to Asakusa Girls' High School in Tokyo. There, she stumbles upon Misa Aoi, a first-year student like her. However, tensions arise when Rin and Misa find themselves competing in a race against Team Dress from the prestigious Musashino Girls' High School. As a result of the race, Rin tries to join her school's Jet Racing club, only to discover that there is none. But, her resolve is unshaken, and she decides to recruit Misa and three other girls to create her very own team: "Kandagawa Jet Girls." With her heart set on winning the annual Kandagawa Cup, Rin, alongside her team, approaches the grandest stage of them all. [Written by MAL Rewrite]

Short specials included in the Blu-ray releases of Dimension W.