5012 AD. Lifeforms from outer space, otherwise known as , suddenly begin their invasion of Earth. Mankind escapes to the moon, and the ground battle between the and the has continued for a long time.
11945 AD. The <243rd Descent Operation> has commenced. Soldiers <2B> and <9S> now engage in the plan to recapture Earth.
While on a mission near the City Ruins, they receive a request from the Resistance to find a missing android. Both 2B and 9S consider that the missing android may be related to their current investigation ordered by Command. Proposal: Begin the search for relevant android.
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