Hi! I'm also trying to figure out the growth chart for TF:DT (though, I haven't been able to run mine for the past month :( ) and, based on posts about previous versions I think I figured out how to get Kiraritchi (though I haven't got to test it yet).
When you have Yumemitchi, go to the...
I haven't found one either. I'm currently operating under the assumption that it's the same as Friends up to teens, then for adults: skill (from whichever dream school class you play 3x first, random if none) and level of care determines which one in that skill you get.
So far I've gotten...