>>96023352
>>96023818
>>96024837
I think Nao was indeed originally meant to be the main rival/love interest but as the series went on she pretty much became love interest only.
It doesn't help that Hikari/Erika has pretty much risen to deuteragonist status so she kinda took the spotlight away from Nao.

>>96023517
>The Momoyama bloodline will definitely continue.
Minae*
Now that I think about it does Michiru know Mirei is Danji's sister?