Thank you very much for translating this omake!! It shows that there are more thoughts put into everything than it might seem and it's always an interesting insight. It's nice to know more about Otogiri. (Old) Japanese red light district like Yoshiwara has always intrigued me.
Now that Yayoi learned about her full story, I wish in future chapters there will be reconciling between Yayoi and Oiran, and she will pass on in peace. Unlikely though, since her power lies with her pride and rage.
That'd be cool. Maybe as an epilogue of sorts after everything is said and done. Asura got his character development (granted, he's a child), so it's not out of the question for her, too, even if it's in the late part of the story. Or so I want to believe. I want those who suffered to finally rest in peace...