RayForce (released in western Arcades as "Gunlock") is a top-down shooter. There are seven levels to play, ranging from battles in the atmosphere of planets to battling over mountain ranges, each with their own standard huge bosses at the end of these levels. The player takes control of a starfighter called the RVA-818 X-LAY, out to destroy any opposing forces.

In the distant future, human governments, across the planet Earth, construct a massive supercomputer, named "Con-Human". The purpose of this computer is to govern the planet's environmental systems, verifying proper nutrients and care is provided to ensure the culture of humans and animal alike.

However, disaster strikes when, after a cloned human's mind is linked with the system, Con-Human becomes sentient and insane. It begins to induce calamities across the planet, constructing corrupt clones of existing organisms, destroying its human masters and exterminating the nature it was intended to protect, apparently intending to replace everything with what Con-Human considers improved versions of themselves.

After prolonged war, Con-Human has succeeded in exterminating 99.8% of humankind, with the remnants fleeing to space colonies. Meanwhile, Con-Human remakes the very interior of Earth. As a result, Earth, as humanity knew it, has utterly ceased to exist, transformed into a planet-sized mobile fortress that is in fact Con-Human's body. Con-Human intends to use the transformed Earth to seek out and destroy the colonies, erasing all remaining traces of old life from the universe and leaving only the new life that it personally created. Now, taking the full-scale offensive, mankind develops powerful ships, one of them the RVA-818 X-LAY starfighter, to fight the oppressive machine by destroying the now-infected Earth entirely.