The purpose is to have as much EXP as you can by talking to and interacting with charming characters; this will allow you make different things later on.
After a period of time, you will need to move from your castle and marry a king in order to protect yourself from war.
There is a nice story and lots of great characters full of charm.
Talk to all of them for gaining EXP (experience) and relationship points.
However, after a small period of time, you have discovered that you have many things in common with your father.
If you want to go to Heaven, you need to prove that you are completely different person now (after an almost-lethal car accident).