Two volunteers gather to become the exclusive slave of Queen Tsubaki. They face a rigorous interview process with the strict dominatrix, enduring harsh whip spanking and verbal torment as tests of their submission. After passing numerous physical examinations, they are fused with enamel through a penis plug. Recognized for their potential as obedient slaves, both ultimately sign a contract to become the queen's personal servants. The film depicts the growth of the two men as they overcome the grueling selection process.