I'm don't know how far the manga will go considering that it only has one light novel volume, but the raw site currently has it tagged as "in progress" (連載中).
EDIT: Although this tweet by the author seems to suggest that chapter 12 is the last one?
https://twitter.com/9t_19/status/1215230034895441920
Now, I'm curious to know how OP she turns out to be compared to the guys!
Likewise, if the men are as crazy nutso as they appear, what does a magic welding woman with the mark signify for making kiddos? Are they gonna want to kill her or capture her even more?
It probably would have been better to escape while the locked up in the room where they couldn't be seen. The auction is still a viable option for attack since anyone dump/desperate enough to pay for a strong magic lineage should mostly be unable to use strong magic themselves.