According to Kaizo, the mysterious “ruins†have showed up again! Following Kaizo’s instructions, Yuga and co. boarded the ship that also acts as a school building for Goha Fisheries Elementary School. As it turns out, the ship that Yuga and co. boarded will be at sea for a month or so. Due to a misunderstanding revolving around Kaizo, Yuga will also fight against the ship’s captain and Fisherman Duelist, Maguro Nanami, in a Duel in the middle of the sea!