Why don't you join us at the castle for a party?
I'll bake a cake!
Yours truly, Peach
This is the first message I saw in Super Mario Run (Android).
While there's no reason why a princess can't fall for a plumber (classic rich-poor romance), it was supposed to happen at the end after Mario saved the princess with his heroism. But, it was weird that she wrote to a plumber in the beginning that way. How did this happen?
Note: This doesn't look like a normal friendship because of social differences. But, if it is indeed a friendship, again, how did this happen?