theres a lotta doujins for this tumour lately being translated.

What's with this Sumireko fever, isn't she a low-key Okazaki Yumemi?

So if I understand this correctly, this doujin is taking the theory that Sumireko is Renko as opposed to just being her ancestor. That's pretty interesting actually, and I could see how that makes sense with Renko being a college-age Sumireko who's forgotten her times in Gensokyo. It also explains why Yukari looked sad when she sent her back to the Outside World, assuming that Yukari is a future Maribel.

So if I understand this correctly, this doujin is taking the theory that Sumireko is Renko as opposed to just being her ancestor. That's pretty interesting actually, and I could see how that makes sense with Renko being a college-age Sumireko who's forgotten her times in Gensokyo. It also explains why Yukari looked sad when she sent her back to the Outside World, assuming that Yukari is a future Maribel.

There was one that seemed like maribel as a extension of yukari and her powers and if she went back to her maribel would cease to exist.