That title sounds like a candy, but can't possibly be referencing that? Can it?
Werther's original is a butter mint (at least that's all I know they make) brand, so I think it's definitely a reference.
Werther's OriginalEven you're in this book.What!? Why am I being treated more poorly I met you sometime before.Wow!Haa!Am I a unique existence!?Eh~ I'm honored!than Marisa and Reimu even though I'm more polite?You've grown to be a fine young woman.shockAhh! You're here, shopkeeper-san.