Shall we date?: Pirates Treasured Love in the Ocean

You are a princess of Yamato, a small country within the Yamato Commonwealth known to harbor ruins of an ancient civilization—and something more specific: the Gardiner's Trove, a weapon of the old world that can only be opened by you. The powerful nation of Saint Cross has moved to take control of Yamato and is arranging a marriage with their third prince to secure access. You and your bodyguard Nagisa flee before the ceremony can happen. Your choices now determine whether you find allies among the pirates or the navy—and whether the Trove stays out of Saint Cross's hands.