In Injustice Gods Among Us Year 3, the full story is a continuation of the dark and twisted world established in the previous installments. The conflict between the two factions - those who support Superman's extreme methods and those who oppose them - intensifies. New alliances are formed, and betrayals occur. We see the development of characters like Harley Quinn, who has her own arc within this turmoil. The story also explores the concept of justice in a world where the line between good and evil has become blurred, with characters having to make difficult decisions that will shape the future of this alternate reality.
Well, the 'Injustice: Gods Among Us' comic full story is centered around Superman's transformation. When the Joker plays his cruelest trick on Superman, it sets off a chain of events. Superman starts to believe that only his way can bring true peace and justice. He forms a regime. Batman, on the other hand, is against this new order. Many characters get involved, like Wonder Woman who initially supports Superman but later has doubts. It shows how far the heroes can be pushed and how their ideologies can clash in a world that has been turned upside down by a single act of evil.
Well, without the cutscenes, the Injustice 2 story might last you approximately 12 hours, give or take. This assumes you're playing at a decent pace and not getting stuck on difficult sections for too long.
A good plot for Injustice Gods Among Us crossover fanfiction could be a time - travel - based crossover. Maybe a character from Injustice accidentally travels to a different timeline in the DC universe where things are much more peaceful. This character would then have to adapt to this new world and its heroes and villains. Or perhaps characters from different eras of DC, like Golden Age heroes, cross over into the Injustice universe. They would be shocked by the state of the world and try to bring back the old values of justice. They could team up with some of the Injustice characters who still hold onto those ideals.
The main plot point is the Joker's manipulation that leads to Superman's downfall. Another is Superman's establishment of a regime. And Batman's resistance against it.