Could you write something, you’re allowed to choose the format, of Namba going through a zombie apocalypse?
Of course I can! Thank you for sending this in, since I mentioned having a lot of ideas for this that I never thought I'd get the chance to rant about and now I can! I hope you'll all enjoy the ranting!
So, the zombie apocalypse comes to Nanba Prison. There's a couple ways I could see it happening. One way it could go is that a visitor, or even one of the prison staff or guards, could unknowingly have gotten infected on the mainland. Maybe they had a random and bizarre experience with someone already zombified and they blamed the encounter on someone just being high on bath salts. Maybe the food they ate carried the virus needed to create zombies. Whatever way it happened, they unwittingly got exposed to whatever makes people turn into zombies and then, when they did get onto the island, the virus really took hold and they went full zombie and started attacking. While that initial zombie was probably put down and put down relatively quickly, they managed to do some damage and spread the virus to at least a couple more people, who then spread it to a couple more before they could be killed and so on and so forth until it's getting more and more difficult to keep up with putting them out of their misery.
Another way it could happen? It could definitely be an experiment the Otogi's were working on together that went terribly, terribly wrong. I think I prefer the first one a little better, just because in this kind of scenario, the Otogi's would either become some of the first to go zombie or just straight up get killed and that really puts Nanba in a real tight spot as to whether anyone survives because they really need their healers and researchers.
Now, in a way, Nanba is the perfect place for the zombie apocalypse to really break out. It's not only inescapable but it's pretty impenetrable, not only with the high walls and security feature but by the simple fact that it is an island. There's only one way on, one way off really. I think that's something that was banked upon during the first initial outbreak, when things were getting bad but still seemed to be under control. Momo ordered all forms of transportation to the island to cease temporarily but overall, the guards figured their strength and diligence alone could prevent it from spreading.
When things started to spin and the zombies started getting more plentiful in number, too much to easily control and take down, Nanba goes into full lockdown mode. Each building is quarantined, much like how we saw Building 5 during the Enki arc. Travel between different buildings is forbidden and the guards are given the orders. Squash this zombie uprising, protect your prisoners, and prevent any prisoners from trying to escape.
In headquarters, Momoko is in charge, overseeing everything, and really tries to keep a handle on the situation. She plans and oversees this as the commanding chief of an army would and believe me, she puts her army to good use.
Of course, she's only able to do that because Mitsuru is also locked safely in headquarters with her. If it wasn't for Mitsuru's communications and technological skills keeping all the different buildings connected and updates kept coming at hourly intervals, Nanba would likely have fallen completely.
Of course, the Otogi's and KAGU-8 are also within headquarters, commanding their teams in a joint effort operation to figure out what the hell is causing all this, to find a cure for it, and to figure the best way to get that cure out to everyone who might need it.
KAGU-8 actually comes in incredibly useful as well because, as a robot, she is immune to becoming a zombie. She goes out of the building whenever it's deemed safe (as in, she won't let anything in and they know she can't transmit the virus back to them as it's not anything skin to skin contact), acting in a variety of manners. Not only can she give them a better view of the actual situation outside of their building, but she can act as a go-between and aid various buildings in need of support.
Because animals also seem to be completely immune to being turned zombie, Kyakuya, Hiiragi, Tsubaki, Sazanka, and Kikiyou also help KAGU-8 in those kind of roles and they're also a valuable source of intel for Building 4.
And Building 4? It makes itself useful. Not only is Yozakura exceptionally strong and more than capable of taking down a single zombie, but he is a very smart man and knows how to research and investigate. Musashi actually is allowed out of his cell, though he must still be closely supervised every minute, under the orders of the Warden, to help as that is something Musashi excels at as well. Building 4 really dedicates itself to helping Headquarters' research and investigation team as much as they possibly can. Even though Hitoshi isn't really the most skilled at research, they help by taking care of the others, rationing out food while still making sure everyone is fed, and really taking over the supervising of the other guards and the overseeing of the prisoners.
Speaking of food, it becomes clear after the first week or so that travel must be established between the different buildings so that rations and provisions can be shared. Not only that, but after the first building or two fell due to zombies, it became apparent that staff needed to have a way for backup to reach them in case things did start to go bad inside a building.
While Momoko and Hajime will definitely need to have a meeting after this whole thing is over, it's really Building 13's time to shine when it comes to finding ways for the Buildings to safely travel between each other. While Jyugo and the others normally keep their travelling within Building 13, Jyugo has probably snuck around to other buildings without Hajime or the boys noticing, just because he could. And with the inmates of Building 13 really being given a little leniency, and the blueprints to Nanba, it's a walk in the park for them to figure out, test, and secure safe passage between the various buildings. Anyone going between the buildings must be accompanied by a Guard, and honestly Building 13's supervisors and guards have the best reputation and everyone wants them to accompany them. The pure amount of just stupid levels of strength and combat that both Yamato and Hajime have make them more than capable of taking on any zombies that come their way. Seitarou and Tsukumo, meanwhile, actually have really fast reflexes and a kind of stealth that makes them really talented at going safely in between the different buildings and at leading groups between buildings.
Building 3 finds their purpose during the apocalypse in several ways. Not only do Honey and Trois team up but they also team up with Ruka under the supervision of Kiji and start to produce various weapons and battle plans and tactics. Honey often collaborates with Building 4, Uno, and even the Warden herself on one occasion when it comes to tactics and plans. But they also do something else that proves useful as the apocalypse wears on. The communications channel gets turned over to Building 3 once a day, where Kiji or other staff from Building 3 just spread positivity, remind everyone of why they're fighting, assure them that things will return to normal, and remind everyone that they also need to take care of themselves. Shower as often as you can, make sure you get your beauty rest, don't forget good skin-care and little mindfulness breaks, just to keep yourself looking and feeling the best you can. After all, if you look and feel good, you can conquer anything, even a horde of zombies.
Building 5 tends to be the building most everyone counts on to actually go out and put those plans and tactics into action. They're really the front-line soldiers of this battle and not without very good reason. Not only are the guards of Building 5 exceptionally physically and mentally strong, but it's inmates are normally quite physically strong and talented fighters in their own rights. Even Qi gets drafted, becoming a sort of combat medic and he's the one to test the zombie antidote, each time the Research Team thinks they have perfected it, out in the field. Other inmates and guards from different buildings do back them up whenever possible, but they are really the ones in charge down on the ground.
