In a post-apocalyptic world, the treasure hunter Riot and his pretty sidekicks are searching for Eyes of Zalem, which they hope will guide them to Rido, the treasure of a long-lost Quall civilization. A limitless energy source, the Rido has the power to even restore life; but unfortunately for Riot, the evil Demsters are after it too.

The story of the mecha anime revolves around 13-year-old Meguru Tokio, who is suddenly approached by a strange woman who is running away from something. She finds out that the girl's name is also Meguru, and although she appears to be around 17 or 18 years old, she has a passionate personality, which the younger Meguru has trouble dealing with. Meguru Tokio gets drawn into the older Meguru's fight with a mysterious organization, and gets targeted by the organization as well. The one targeting them from the organization was the narcissist, Rei. Although the younger Meguru can't believe that the older one came from the future, she fights alongside her in a dimensional robot. After fighting with Rei, she finds out that even though the other Meguru is older than her, she is Meguru Tokio's descendant. After finding out that someone has jumped into the past by the older Meguru's history surveillance device, the two also make a leap back into the past.

Natural disasters have devastated planet Zi, killing off almost all life. A thousand years later humans have gradually re-established civilization, salvaging ancient Zoids through diving and mining efforts. In a village whose most previous item is a giant sword which they worship as a holy symbol. A teenage boy discovers an ancient Liger-type Zoid while on a deep water salvage operation. Suddenly the village is attacked by skeletal Bio-Zoids intent on stealing a powerful generator located in the village. Our teenage hero awakens the Liger and discovers that the town`s sacred sword is the Liger`s weapon, together they fight off the mysterious Bio-Zoids. At least for now...

A mysterious gem called the "Skull Stone" is said to be able to reveal the location of the largest vein of gold in the world. This legend has entranced many people who wanted to get their hands on fame, power and wealth, including the trio of villains in this show: the "Dorombo Gang." However, their hunt for the Skull Stone is not as easy as they imagined, mainly due to the faulty information they receive from their leader, and most of all, by a justical duo of pursuers called the "Yatterman"!