[1] The story is set in the year 9013 (Mobile Century 8013) where humans no longer inhabit the planet Earth.

However, remaining military robots continue to fight for unknown purpose(s).

Three non-combatant robots, Fuji, Kato, and Mori attempt to end the war that lasted for 7 millennia by investigating on human laughter.

The opening theme is "Break the War", sung by Confection Planning, and written and arranged by Steel Soldier.

The ending theme is "Reason for Freedom" (自由という理由, Jiyū toiu riyū), which was written, arranged, and sung by ZAQ.