Team Ninja have updated the official Dead or Alive 5 website with a simple summary of the game’s story. Here’s what it says:
Two years after the destruction of the TriTower, headquarters and symbol of DOATEC…
Helena Douglas has begun the task of rebuilding DOATEC, this time with the aim of using its technology for peaceful ends. She has ordered the dissolution of the Biotechnology Division, the indefinite suspension of the Military Division’s Projects Alpha, Epsilon and Omega, and the expulsion of all members of the Donovan faction from DOATEC’s offices around the world.
Now in the same position once held by her father, DOATEC founder Fame Douglas, Helena has announced that she intends to hold the fifth Dead or Alive tournament, to show the world the principles and philosophies upholding the new DOATEC.
They also provided this character relationship chart: