"Rib Princess"
Cover art prominently features ribs
Second to last page has an entire synopsis for it but never mentions the rib gimmick
I feel like this is a subtle troll by the mangaka
My favorite type of villain second chance story, with a genuine villain going through genuine reform (even if he's being prodded into it).
For those worried about the date it looks like there are 6 2-part chapters up on the publisher's site already. Probably not going to run out of raws any time...