The government of Japan estimated the unmaned mission would cost $2.57 billion over the next ten years, so this will be the problem of the government to think about how to reduce the expenses of the other thing.
The purpose of this mission is to set robots with solar panels to generate energy and have an observation device to gather geological sampes. The materials wold then be sent back to the Eart by rackets. The robts would work form the lunar base at the moon's south pole from 2020.
It will become difficult if Japan's mission is delayed because China, India, and other countries are aiming to probe the moon.
However, I think if Japan acheive this mission, ti will show to different country that Japan is a country leading technology about space.



