Rule 1: Any intentional harm, betrayal, from someone important will cause you to leave this world.
Rule 2: If you are not aware of your own death, you will not really leave this world.
Rule 3: Unless you find someone who values you, you will continue on this journey.
Rule 4: If you still feel that the person who betrayed you is the most important, and this feeling remains unchanged for ten years, you will be able to return to the world you once passed.
The supreme rule: This is the rule that overrides all rules - please be happy.
Other than that, there are no restrictions.