In japan, the emperor, a hereditary ruler, serves at the head of state, while the people participate in governing and elected officials make laws. what type of government does japan have?
oligarchy, direct democracy. communist . parliamentary democracy/

From the description, it is clear that Japan’s type of government is (D) parliamentary. To be more specific, Japan is a constitutional monarchy – thus, the head of the state is represented by the monarch, which in the case of Japan, is an emperor, while the head of the government is represented by a prime minister.  

The parliament of Japan, more specifically the legislative body, is called The National Diet, which consists of a lower house called House of Representatives and an upper house called the House of Councillors.