Kuro, Keita and Akane head to Okinawa, staying with Keita's grandfather in order to confirm whether Keita's mother had really died when he was young or not and what to investigate in the island. Reishin had started plans to gather all Master Roots under the protection of the Kaionji Group, led with the assistance of Kuraki. As the trio continue to enjoy their Okinawa vacation, Hiyou and his contractee arrive in Okinawa as well, preparing for another mission.