If it's a Psychology class/lesson I would focus on the 4 points you mentioned primarily. I wouldn't forget about the Kana/Greetings per say, but how about incorporating them into your first 4 points?

For example, on your second point of the Treatment of others & Politeness you could cover greetings here such as how someone more Senior how people should bow lower then them when greeting.

You could also cover another area thats mixes of the Greetings, Politeness and some Kana areas such as how people address each other with Honorifics: -San,-Kun,-Senpai,-Chan,-Kohai,-Sama etc

If you've covered these already then 'doh!' to me

Good luck with it anyway! Let us know how it went