The Fugaku was originally in a Phantom Field, seemingly belonging to the Mitsurugi Agency. When the Observer of the Phantom Field was freed, it began to form into a Possibility, but for some reason, it was being erased; Kagami Hajou and Ciel Sulfur took the Fugaku to escape. They began using it to traverse the Boundary and discover other Phantom Fields, hoping for some clue on how to restore the Possibility they came from.
There are several areas to the Fugaku. There is a staffed kitchen and cafeteria area that is free to use by residents. There is a laundry room and a medical bay, as well as multipurpose room which is typically used for briefings, but can withstand combat training. There is also the command room. The Fugaku is staffed and the Chrono Phantasma (Those Who Should Not Exist) who are summoned are also resident onboard the submarine.
- BlazBlue Alternative: Dark War, Chapter 3, 12 - 1
- BlazBlue Alternative: Dark War, Chapter 2, 1 - 1