They haven't made these 100 yen notes since 1956, of course Kourin has one (though they are still legal tender, which is probably why Sumireko had it).
What !A day at Kourindou 55I see you're teasing Futo, shop masterPrince-sama !You said prince...?
So you are Prince Shoutoku?Who's this old man!??It seems that there are pictures of you on the bills from the outside world.When Sumireko-kun showed me this, she said it was indeed Prince ShoutokuI said it's you.
It matches you perfectly.What an honor, you'll make me blush.