Kiaidan 00

In 21st century, Tokyo was suddenly attacked by combined forces of robotic and organic alien races. A special giant mecha fighter craft was constructed in order to avert the threat. A young pilot is sent on the most dangerous mission of his life.

Instead of the traditional secondary weapon system the game offers charged modes for all the weapons. When a weapon is charged it either becomes more powerful or gains new properties (for example, the extended arm becomes longer and is controlled from a distance). The player character's health is represented by shield units, which can also be picked up in the stages. Dialogue and cutscenes advance the story between and within missions.