It's still not clear how to get #72 and #80. For #72, I've angered basically all the shadow ladies I can find (and let them to catch me), but still haven't got this wallpaper. As for #80, where is the "reef"? I'm sure it's not the underwater reef where you will end up when going down from the grand piano, because there's no ghost-Urotsuki there, at least I couldn't find any after exploring the whole area...