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).
I said it's you.
It matches you perfectly.Who's this old man!??When Sumireko-kun showed me this, she said it was indeed Prince ShoutokuWhat a honor, you'll make me blush.It seems that there are pictures of you on the bills from the outside world.You said prince...?
So you are Prince Shoutoku?What !A day at Kourindou 55I see you're teasing Futo, shop masterPrince-sama !