Yamato Takeru

In the 25th century, a spaceship carrying 300 people leaves the earth in search of a new world in the solar system, but an unexpected accident occurs. They crash into a black hole which is connected to another universe. The people on the ship are cast adrift in an emergency capsule to a planet called Ismo. The story begins 12 years after they have reached Ismo.

Ismo is a star of the Onam System, which corresponds to the Solar System in our universe. It is the only planet left in the Onam System. The Death Star called Yomi is a comet which regularly approaches the Onam System.

There were once 8 planets in the Onam System. Many years ago, in the time of the gods, there was a war against the evil monster Yamatano Orochi (an 8-headed snake-like creature). The gods won the battle. Yamatano Orochi was locked into 8 stones, one of which is buried deep in the center of each planet. Nobody was supposed to have access to the core of the planets. However Tsukuyomi, an evil god who rules Yomi, succeeded in reaching the stones one after another, destroying 7 of the planets using his powerful robots, the Sky Warriors. However, when he tried to acquire the last stone from the planet Ismo, the most powerful Sky Warrior, Susanoo, got out of control and was blown away.