The warlord Guardia was banished from the planet Sephiroth, otherwise known to be a very peaceful planet. Many years later, he returns, complete with an entire army which overpowers the Guardian army, leaving one hope: the newly developed XDR craft.

XDR is a horizontal scrolling shooter in the mold of Gradius, featuring upgradable weapons and six stages of shooting action. The game features a vague science fiction theme, and includes six stages with a boss at the end of each. There are three difficulty settings.