Life was good... Life was peaceful... Until they came.
Wielding powers far beyond the regular man, the organization know as Xcution came Tokyo. Somehow, they broadcasted to anything and everything that could receive a signal. They declared war on mankind unless you joined them. Within a week, they held Tokyo in the palm of their hand.
The JSDF mobilized at a total war scale and cut off the city from the rest of the world under the terms of biological terroism. What they didn't know is that many of the common men rallied behind the enemy in such numbers to outnumber their own in their revolution. The War for Tokyo began.
Now, because of the massive influx of spiritual power, hollow activity increased to point of leaving the common man dying in the streets.
Very soon after, the Gotei 13 enclosed all of them within a barrier and set out to excute Xcution and the hollow threat. Now, you're home is a battlefield! Luckily, you have the tools, the ability to fight!
Alright, not that a little of the exposition is out of the way, let me welcome you to the second piece of the triangle.
This Bleach game will not being featuring any of the canon characters. A whole new story with new characters.