At 00:58 of "Might quit" when it shows some kind of character selection screen, there a specific character that caught my attencion wich is the one who is called Princess Realistic, and I've been wondering if that's a reference to "I'm a Princess" released later.
no. the princess song was not conceived yet. But, it would be conceived probably within a short number of days or weeks later. so the relation is just that it was created by the same person in a similar time period