Megarette and the giant robots are ready for a long march towards the historic, obscure enemy: the Neanderthals.
The road to the showdown is the path of a great river, but it will be studded with danger and terrible discoveries that will lead the group to face strenuous physical and psychological battles.
Will they manage to reach the goal? Will they defeat the Neanderthals? What changes will their actions lead to?
With this final chapter, Megarette's journey comes to an end. The young Anna, the giant's alter-ego, is ready to find her place in the universe.