Ashitaba-san Chi no Muko Kurashi - Vol. 7 Ch. 60

[M7in]

Still, I wonder what has happened to middle sis, papa, and auntie.

 

[farkenell]

Still, I wonder what has happened to middle sis, papa, and auntie.

I was wondering the same and someone briefly mentioned it earlier. There is another related manga released by the author. Basically gives you the gist of the middle sister.

https://mangadex.org/chapter/33078a1d-e8f5-480b-8e5f-dff17667f3ac/1