During battles, the objective is to reduce the opponent's hit points from 1000 to 0 by using different custom robos and their arsenal of weapons, including dash attacks, guns, bombs, and pods.

Fights take place in a Holosseum, a battle arena designed for custom robos.

Once it runs out, their robo gets "downed", which means that it becomes unresponsive for a couple seconds; they can speed up the process of recovering by repeatedly tapping the A button.

If the player repeatedly loses the same battle, the game offers the option of reducing the opponent's initial health.

At this point, the game leaps to the present and Hero suddenly receives a letter stating that his father has just died.

He eventually manages to join up with a group of bounty hunters known as the "Steel Hearts", where he meets Ernest, Harry, and Marcia.

Hero and the rest of the police force leave the safety of the dome to defeat Rahu again, along with the organization known as the Z-Syndicate, who are trying to control the entity for their own ends.

After defeating the syndicate, Hero meets an old friend of his father's, and the brother of Marcia of the Steel Hearts, a spy named Sergei.

In the recording, Hero's father explains that he left to form the Z-Syndicate in an attempt to inform the people of Rahu's impending attack.

The other members soon lost sight of his vision and betrayed him in an attempt to the seize control of the Syndicate and Rahu.