I am interested in the history of Japan since my parents are Japanese.
It is very interesting, since the first human gabitation in Japan was in prehistoric times.
I wonder how many islands are part of Japan?
Japan even back in prehistoric times was actually an archipelago. 
What is an archipelago?
Like you said, it is a group of islands like Japan is and was back in prehistoric times.
I know Tokyo is the capital but what are some other big cities there?
I'm not sure, but I know that the imperial dynasty continues to reign over Japan even today.
Does Japan have an emperor or king?
I'm not sure, but I know that there have been many Japanese emperors even since prehistoric times.