Continues from directly after the events at the end of Itsuwari no Kamen/Mask of Deception.

"...I leave Her Highness... in your hands."
"Nekone, live on... and find happiness."

With these final words, Oshtor's soul finally found peace... leaving Haku entrusted with his sister and the princess. For the sake of his friends, and to fulfill his promise, Haku casts aside the name he was given... and dons his fallen friend's mask, choosing to live on as Oshtor.

Armed with his wits and the power of Oshtor's name, Haku faces a battle more dire than any before. Nekone steels herself to support Haku through whatever comes, suppressing the pain of her dear brother's death. Their friends mourn the loss of two dear comrades: Haku, whom they believe dead, and Kuon, who left them for her homeland.

It is here, on the cusp of a new conflict, where we return to this land. The flames of war are about to consume Ennakamuy... and soon, all of Yamato.

[From Atlus]

The next game in the series, after Utawarerumono: Futari no Hakuoro and a prequel to Utawarerumono: Itsuwari no Kamen, is a JRPG Monochrome Mobius: Rights and Wrongs Forgotten, available on PS5/PS4/PC.