An ancient God called Ranga awakens on an isolated island in the South Pacific where it has been slumbering forgotten by mankind. Three sisters living in Tokyo—Minami, Ushio, and Yuuhi Shimabara—discover they have inherited this Island Kingdom, along with the huge God. When Ranga shows up in Tokyo, it soon becomes a source of wonder and conflict for the three sisters that control Ranga, the people who want to destroy it, and ones who want to use it.

When three complete strangers, Mishiba Toki, Nakajyo Nobuto, and Saitoh Kazuo, are hired by a corporation to compete in the Bus Game, an illegal dog-fight conducted in strict secrecy, they are given the team code of "Team AAA" (Triple Anonymous). This group of three who differ entirely from their living environments to their personalities have to work together effectively, but without mutually wiping out their mistrust of each other or prying into each other's privacy. They only have one point in common—each of them need a large amount of money for their individual circumstances. To get the money, they must play in the game despite their very own lives being at stake.

In Japan, the country that inspired the slogan "Born to be Mild," the blood of young men still runs hot. In the old days they'd go off into the country and hack each other up with swords, but these days, what with school, that isn't very practical. So some of them do something very un-Japanese. They strap on a big bike, roar around annoying people, and pound anyone they consider dishonorable. Now meet Eguchi Yousuke, leader of a high-school Biker gang AND the school's handicrafts club. Which means he divides his time between fistfights and fancy needlework. And if you think he's weird, wait until you meet the rest of his gang...

The Mach 5 is one of the fastest and most technologically advanced race cars built by man. Equipped with various gadgets and a powerful engine, it provides a challenge for anyone who would dare race against it. The driver of this amazing vehicle is Gou Mifune, a teenager who dreams of breaking into the world of professional racing. In spite of this, Gou's father and the creator of the Mach 5, Daisuke Mifune, does not want his son anywhere near a racetrack. Undeterred, his girlfriend Michi, younger brother Kurio, and Kurio's monkey sidekick Sanpei become Gou's biggest fans as he sets out to become the greatest racer of all time. However, Gou soon learns that becoming a professional racer is not easy. From the underhanded plots of corrupt businessmen to stiff competition in the form of his rival, Racer X, Gou faces many obstacles on the road ahead, and has a lot to prove before he can cross the finish line. [Written by MAL Rewrite]