Japanese prison:
Cannot lie down during day.
Cannot peer outside through windows.
No talking during meals.
Intra-building walk is always performd en-group, requires robotic marching, swinging arms straight up, parallel to ground, a-la North Korea, or maybe Republican Guard marching.
A trillion very exacting rules, all of which ARE enforced, they fill a 50-page booklet. Prisoner booklet knowledge is tested.
Most gaijin go to Fuchu, outside of Tokyo.
TOTALLY SUCKS.
If they hang you, they don’t have to tell your family and will even lie about it, though they do eventually find out. There are 3 buttons, one each for 3 guards, one of the buttons opens a trap door.
NO faggy “humane” lethal injections in Japan, none.
Ah!
The condemned is only told they day of his execution on THAT morning, ergo all condemned spend each day wondering if he’ll die the next day.
Many go nuts.
One of the guys in my squadron was convicted on a drug charge. He wrote us a letter detailing life in a Japanese prison, pretty much what you stated. I was in the Jeep that took him to Naha to be turned over to the Japanese authorities. He was crying as they put the cuffs on him.