That second part is huge tbh. Japan doesn’t have any rights to an attorney, and interrogations are allowed to last for literal days at a time. If you’ve been kept awake for three days straight with no food and minimal water, while cops rotate through in shifts, you’d sign whatever piece of paper they put in front of you just to be able to get out of the interrogation room. They have a near 100% conviction rate, many of them by confession due to prolonged interrogation.

And yeah, Japanese prisons are brutal. You have basically no free time. You’re expected to sit quietly in your cell until breakfast. They slide breakfast through the bars, and you eat in your cell. Then you sit quietly in your cell until lunchtime and you’re allowed to go to the yard. They line you up single file, where you silently march to the yard. You’re expected to kneel silently in the yard and meditate for your 15 minutes of sunlight per day. Then you return to your cell and sit quietly until dinner.

The Japanese have a saying which roughly translates to “the nail that sticks out gets hammered down” and prison exemplifies this; Any deviation from the expected “sit quietly, don’t move, don’t interact with each other” is punished swiftly and brutally by the guards.