Botei, the unbeatable champion of the Intergalactic Bodybuilding Contest, have run dry on his protein supplies, so he decides to enslave various planets to set up factories of protein for his own use. In order to stop him, the Heavens send out his two champions, Idaten and Benten, who now must face Botei's Builder Army.

Botei, the unbeatable champion of the Intergalactic Bodybuilding Contest, have run dry on his protein supplies, so he decides to enslave various planets to set up factories of protein for his own use. In order to stop him, the Heavens send out his two champions, Idaten and Benten, who now must face Botei's Builder Army.