Rangers. Riders. Makai Knights. Sailor Scouts. These heroes and others have existed in the world for years, operating in different countries, operating together, fighting different enemies, fighting the same enemy. They are brethren in arms, all striving for a better future of some sort, trying to stop an evil that threatens them.
Split into differing factions, they hold a friendship and alliance with each other to some extent. However, things have started to become strained.
The Rangers, under the universal leadership of the being named Zordon, have been struck against. Zordon has been slain, leaving them in disarray, and with all evidence pointing towards the Riders as the ones who did this. Attempts to have rational conversation have fallen apart, and some Rangers and Riders have come to blows.
War has been sparked, and the two sides have started to enter open conflict. The Makai Knights look onward, having their own issues to deal with, while the Sailor Senshi try to figure out what to do, and the UFDA attempt to keep people safe from the conflict with their rescue work.
This battle is going to rage long and hard, and nobody can seem to stop it. There are those on both sides who don't care, or don't want to fight, but the collective groups aren't as easily swayed.