Set 10 years after an alternative ending to Fallout 4, The Minutemen, the Brotherhood of Steel and the Institute have united and helped form the United Coalition of the American Commonwealth (U.C.A.C), with the Minutemen helping with settlement development and expansion, The Brotherhood maintain the peace and security, and the Institute working on cleansing the Commonwealth from the nuclear radiation.

However the Sole Survivor has another challenge ahead of him, and soon will find a world in the state that’s exactly like his own, this is that story.