personally not a fan of time/event loops since they've been done to hell and back over the past decade (and before that, yeah, but it seems like it's the answer to everything these days). too much shit went down in this supposed loop, it would be impossible to replicate as is implied. you could try to fill one of the plotholes by saying one of the maid clones could act as a physical stand-in for her mother every loop, but her father didn't have anything like that
the kaibutsu sister knowing what was going on kind of implies everyone else had been there as singular entities for at least a couple sabs, but that could be disproven by the end - which, if sabi-tsuki were going to remake the world and continue the flow… why would she introduce another sabi when it's pretty clear it would just come after her dumb ass too. she'd have to be a fucking moron to not realize this before adding a new one.. how could she even be in control of the flow or any experiments to begin with if the ending goes on to contradict and say her mother was still the one ultimately running everything and knew the consequences of each flow
the first two chapters were relatively okay and i like how the author managed to cram almost all of the effects in; really, boiling it down though i wouldn't say the theories are any different in comparison to the west aside from it beginning with there only being one 'real' sabi and her suicide/they're all clones in a loop.
fatal illness leading to physical decay, temporary cure in plants, experiments on children similar to (if not) herself, the kaibutsu (and smile) being friends until they're done in by the decay/turn against her, kills 'herself'. it was just handled a different, more literal way.
three less skeptical grimaces because the art was cute and haha disregard this i suck cocks