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It’s kind of a difficult story, but here we go…

Placed in a dystopic future 20 years after the last “Energy Wars”, the story is centered on Amane, the daughter of a scientist responsible for the perpetual motion machine that sustains life in a dome where people lives their everyday life, in the center of a devastated dead land due to environmental disasters.

Amanatsu is a robot that lived with Amane since she was a kid.
The short CG film starts when Amanatsu grabs the key to the perpetual motion machine, and sets off for the “end of the world”.

Lucky for you if you can read/understand japanese. xD

The CG short animation was made by Kamikaze Douga, a studio famous for working with prized music video clips.

Source: AnimeNewsNetwork