Both of Saya's parents are potters, and her father is Japanese, so an Asian-style tea cup is rather fitting. But what's more important is the Minnie Mouse decoration. Saya's parents recently took her to Disney on Ice, and she was lucky enough to get within arm's reach of Minnie. For weeks after, Saya told everyone and anyone, "I touched Minnie!"
So now, Saya can touch Minnie every day of the week.