Part 1: Watashinonamaeha Doflamingo. Sureddo no kotei

The principal of a certain school uses his political power to call the 10 strongest heroes in Japan to tell them about a project he has that tries to turn the scariest person in history into another hero. After a talk they all accept and go to the prison with the greatest security in the world. The Tartarus.

Will they be able to make this idea a reality?