Thank you, Daisy! I believe you have helped me find my peony's ID - Shimane Chojuraku. It looks exactly the same!
I was also excited about the result of this tiny young bush. I got only 3 flowers this year but they're huge and fragrant. Didn't expect they would be so pretty when I brought it home.
Now I'm looking for more species to buy. Obviously I can get a lot of ideas from this forum here.