As the cliffhanger leading into the newest episode of the series, Komurasaki told Zoro that her true identity was that of Momonosukes younger sister, Hiyori.

Episode 936 of the series begins to break down her true identity as she begins to reveal more of herself to Zoro as she begins to trust him more.

As we start to see in the newest episode of the series, Hiroyi Kozuki didnt know yet whether or not she could trust Zoro but hoped that he would be able to help her find her younger brother.

Figuring out that he was from a foreign land ( and was kind enough to help save her and O-Toko from an attacker ), she had put together that he must be part of the efforts to bring back the Kozuki clan.

She made the assumption that Zoro could be her brothers ally, and thankfully Zoro is indeed his (and therefore her) ally.

Unfortunately, the episode does not get into the full explanation of her past (such as how she eventually takes on the Komurasaki identity) but she confirms that she is indeed Momonosukes younger sister from over 20 years ago.

Shes now 26 years old, and now shes technically Momonosukes older younger sister.

She also reveals that O-Toko was one of the few others that also knows her real secret.

They had Hiyori remain behind in order to preserve the bloodline just in case something happened to either her or her brother, but a member of the Akazaya Nine had remained by her side and protected her for several years.

One Piece Episode 877