The first OVA, Burning Clock, tells the story of the Aiba family, goes into further detail about Shinya and Takaya's rivalry.

Nian Bing is the son of a fire mage and an ice mage. After both of his parents were killed by the Ice Lord, Nian Bing received both of his parents' magic gems. When Nian Bing was trying to escape from the Ice Lord's followers, he managed to cast both fire and ice magic at the same time. An impossible feat for a mage. He fell from the cliff, unconscious, and was saved by an oldman. After he woke up, the oldman gave him a food so delicious he never tasted before. It turned out that the oldman was a genius chef, once called a spirit chef. And he wants Nian Bing to be his disciple no matter what! Is Nian Bing able to seek vengeance while aiming to become the greatest chef?

A devil sends two cities; Kujukuri City in Chiba Prefecture and Dallas in the U.S., to ten thousand years ahead in the future, makes them fight each other, and enjoys watching over the fight. The devil's name is Bazusu. So Tanbara Gai, a member of Time Patrol, fights this devil to stop the atrocity.

(Source: AniDB)

A.D. 2040—Thirty years have passed since the battle between the Earth and Zentraedi forces changed the lives of both races. On planet Eden, a top-secret project known as "Supernova" is being held to determine U.N. Spacy's next-generation variable fighter. Competing to win the funding are Shinsei Industries' YF-19 and General Galaxy's YF-21. Piloting the YF-21 is Guld Goa Bowman, a half-human, half-Zentraedi. Shinsei receives its new test pilot in the form of the unruly fighter pilot Isamu Dyson, who was once a friend of Guld. Meanwhile, as Isamu and Guld furiously battle to see which of their fighters is superior, a Virturoid Idol named Sharon Apple is to perform her debut concert on Eden. In charge of Sharon is producer Myung Fang Lone, another former friend of Isamu and Guld. When the three meet each other, old disputes spark from a troubled past. Little do they know that their past incidents—along with the Supernova Project and Sharon Apple—will somehow bring them together.