The sequel to B.B-DAMAN BAKUGAIDEN starts when SHIRO BOM and AO BOM are members of the B-da cops who protect the peace of B-da Union. One day, they see a space ship being chased by space pirate and they crash into the wilderness. Princess (AKA BOM) whose kingdom has been attached was lying beside a shining gem with mysterious power called "Crysmond". The enemy is after this gem!
Joined by KIIRO BOM and KURO BOM, B-daman’s adventure to protect the Crysmond from the Devil Veders starts…

(Source: d-rights website)