Trippy, and rather brutal. Suma has been having sex with Futaba #2 so I'll just
headcanon interpret the baby in the end as their child. And as a child she will not suffer the tragic fate of her mother... (copium)
I swear I've read another manga before where the girl (actually a woman, she's married) also spontaneously creates clones of herself, but IIRC in that one the process is not uncontrollable like here, there is a way to stop it.
One of the clones also live hidden in an apartment and may or may not be having an affair with the husband. Now I need to find it again...
EDIT:
Found it. Lo and behold, it was done by the same scanlator as this. No wonder I couldn't find it on MU, it has no entry there because the scanlation didn't have a group name and thus can not be submitted.
@GigaNerdX
I would like to suggest for you to create a group here on MD (even 1-person groups are allowed, and better than submitting scanlations as "No Group") so that information on your releases can be submitted to MangaUpdates. This will allow creation of entries there for the two oneshots you've scanlated so far (MU's site rules do not accept "No Group" releases). If you choose to make a group here, please change the groups associated with your uploads from "No Group" to the one you've created. Optionally, you can also claim the group following the steps and be granted the Group Leader role, which comes with additional permissions that may come in handy for you in the future.