One of my many "Red Flags" for plot writing is:
- A female MC who just "goes with the flow," and never attempts to become a driving force for her own destiny
I think this one is going that direction. The double isekai girls where one is "bad" and one is "good" is also a little tired. That they're both sisters from Earth is nice, but I feel like much more could have been done with that. And the name stealing is straight "Idiot Ball" trope, it just doesn't make a lick of sense, regardless of the major plot point it's meant to represent.