First, I give a presentation comparing and contrasting my junior high school in the US with Japanese schools. Throughout the PowerPoint, I emphasize "have to", "don't have to", "must", and "must not". Some examples: "Students in Japan have to change their shoes. Students at my junior high school don't have to change their shoes." "Students at my junior high school have to take 8 classes every day! But they don't have to clean the school." Etc.
During my presentation, I have the students take notes on the "Part 1" worksheet of things they like better about my school and things they like better about Japanese schools. I try to give both positive and negative things about my junior high school.
After listening, they do Part 2, and they can write their own school rules! These are really fun to read.
I've attached my PowerPoint presentation as an example, but I'm sure all of our JHSs were a bit different. Change it as you see fit! PDF versions of the worksheets are also attached.
For added fun, I like to pass around my school yearbook during this lesson while they're writing so they can see pictures of junior high school life in my country. And they can also laugh at my school picture.