In the year 2323, Earth is a desolate wasteland. Wars and human-made disasters have depopulated the planet, leaving the soil contaminated and infertile. The air quality is equally poor. The elites, rulers, their transhuman slaves, and the last surviving underlings fled with their spaceships over a century ago to establish a new colony on Mars.

Left behind are the robots of the 420 series and the simple working robots of the X-100 series. They tend to the hemp farms, which were once grown all over the world to detoxify the contaminated soil and try to make it fertile again.

The first spaceships were supposed to return fifty years ago to check on soil regeneration and air quality, however no one came. Radio contact with Mars has been lost for several decades, and the fate of the Martian colonists on the neighboring planet is uncertain.

The story is told by robot A-420 on a reconnaissance flight. It controls the vast hemp fields, farms, and facilities in Zone Z.

The 420 series has reached the highest level of development using the latest AI technology. Over the years, some models have even developed a certain emotional intelligence, or perhaps it was a form of consciousness?

On its journey, A-420 meets other colleagues of their family, each with their own unique stories to tell.