Seeing as I live in central Tokyo, I'm pretty sure I'd be utterly screwed. If the zombocalypse hit during a weekday at noon that'd mean close to 35 million zombies roaming around. I live in a 32 floor apartment building on the 11th floor, so if I could secure the one floor and block off both stairways I'd be pretty safe. After living through the March 11th earthquake and subsequent food, water and gas shortages, I stocked up on supplies. Got enough water for at least a month for 3 people, medical supplies, canned food, sleeping bags in case I need to rough it outside, high-power flashlights with lots of spare batteries, emergency packs stocked and ready to go at a moment's notice, and a bunch of other stuff. No guns or weapons, which are nearly impossible to find in Japan, but I do have a blue crowbar I named Cherenkov, and I do know a few stores that sell antique katana, so if I could make it across town I'd be able to get some blades. There's the police station about 10 blocks away, so if I could get into that armory I'd at least have a few revolvers. Plus I live on an island so if I could destroy all bridges or block them with cars I could seal off an area. But in all likelihood I'd be chewed up the second I got out of my house. Too many walking corpses to dodge here.