That's what it implied.
Beyond that, I'd have no trouble seeing Itsuki as the bride, except I can't see her being the kisser. Her feelings weren't developed/strong enough by then. It also makes some other moments, like the end of Seven Goodbyes where he sacrifices Rena's charm to save Nino, the fact that he was wearing Raiha's charm on his wedding day, identifying Miku in Scrambled Eggs, or the conversation at the end of the first chapter, seem like really odd narrative choices. Ideally, we'd be getting some clues that point to her as the endgmr, but her development has been rather bland and muted compared to the others. So much of her argument depends on her being the main girl.