What is with all the advice about romantic things? They are past that point. Now, instead of trying to make idle chit chat and calling her, he needs to go straight to the issue and ask her what happened; Why she stopped being friends with him.

On another note, you need to stop obsessing over Japan. It's just another country, and it has its fair share of serious problems. If you ever hope to be more social you'll need to find some new hobbies to add to your life.