it's a solid 4 star novel IMO its a basic science in magic world novel where the MC is a scientist trying to figure out how the fuck magic even exists. the author does a decent job describing actual scientific formulas so they at least paid attention in the STEM classes of their education. the sisters don't play any role that I have seen in the novel beyond being background characters so its not one of the shitty "super powerful sisters love me because reasons" bull that came outa china in mass a few years ago. its a genuinely good book and I recommend it to people who want to read about magic and science interacting.