I hope someone... anyone can help me...
The manga Flesh and Blood by Fuwa Shinri is a doujinshi, right? So on which manga is it based? Is there a main story or so?
Any help is much appreciated!! 😀

Edit: Oh and are there any indications as to a continuation of this series? Will there surely be one? 😕

It is an original doujinshi.
Flesh & Blood is not only a doujinshi, it also contains a novel.
The novelist is Sugawa Kiyomi <-- she isn't on MU. They probably did a collaboration. Fuwa-san would draw parts of the story in manga form, while the rest was beautifully detailed in novel form. Thus would explain why readers would feel FLESH&BLOOD was incomplete or a cliff hanger.

Hope my info helped!