Ikki and Erika decide to do a report on Medabots and Medafighters for school. Metabee finds a Mermaid Medal while strolling. The peeps put the medal into Brass and they find out that this medal was lost when her Medafighter had to move somewhere else, and forgot her medal. Metabee insists on finding Oceana to 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 she is, located 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.