This will probably remain incomplete
Ren died on Nana birthday. Nana probably disappeared after that for a yet to know reason.
Nana and Takumk have now 2 children, satsuki and Ren, they almost got divorced. I think Nana may settle for Novi without divorcing Takumi, while Takumi is probably all about Reirá (he fucked her at the end, this mothefucker)
Nana