After the third world war, nations devastated by biological warfare no longer have the ability to defend the wastelands, so the defense of these territories is left to private military companies like Griffin & Kryuger, whose android soldiers or "tactical dolls" are tasked with fighting Sangvis Ferri's rogue android army. M4A1, the indecisive but possibly capable leader of the elite "Anti-Rain" unit, must now safeguard her teammates in a series of missions to reclaim the upper hand over Sangvis Ferri.