The fact he already knew two of the girls for some time before rescuing the third is quite wild.
Not to mention one of them has the
same name as the classmate, Kohinata, using it in a public space as a waitress, but MC dismisses it because she's not
that Kohinata that he knows from school. How common is that surname in Japan?
Also, the other girl, 'Nayu', is literally 'Yuna' with her characters reversed, so it's practically using her own name, as well, but that's a common name for Japanese girls as far as I've noticed, so I couldn't blame MC for that, but it's not really creative to hide her identity, either.