Uh I guess you didn't see the 4th episode then? The turkish prison... STRICT and WORSE are two very very very different terms and meanings.
For example in that episode the girl put extra water on her hair and was told to stop, but she didn't. The prison guard could only yell at her but not beat her. In other countries the prison guard would of beaten her. In America they might of subdued her with a tazer gun or something. Heck she was released after serving 18months, and the guy in Turkey served an additional 30 years then had to escape.
Is prison in Japan strict, yes it is, is it worse NO. Prisons in America are probably worse then Japan. You have roving gangs in American prisons, people getting shanked, drugs getting dealed etc etc etc. In Japan that type of stuff hardly ever happens.
Remember strict is a different word then worse.
Strict is where there is a disciplined regiment, no talking, strict rules.
Worse is where people get raped, killed, tortured, and there are many countries outside of Japan that do that.