Ikki and Erika decide to do a report on Medabots and Medafighters for school. Metabee finds a Mermaid Medal while strolling. They put the medal into Brass and they find out that the medal was lost when her Medafighter had to move somewhere else and forgot her medal. Metabee insists on reuniting Oceana and her Medafighter Hannah. When they find her, they find out that Oceana's body was lost during the move too. Erika, being the great investigator that she is, locates the guy who found Oceana's body, but he refuses to give it back. Now Metabee has to Ro-Battle Kuraba, a Crab type Medabot, to win her body back.