Shiki and Homura are forced into a fight with a massive ore creature called Black Rock. Rebecca and the rest of the crew arrive to assist, using concentrated firepower and Shiki's gravity powers to defeat it.
Despite defeating the creature to bring their "prisoner counters" to zero, Madame Kurenai reveals the counters were a lie and resets them to 100,000, intending to keep them enslaved. Edens_Zero_21_Pro_ACB.mkv
The terms in your filename typically provide technical context used by fansubbing or encoding groups: Refers to the episode number. Shiki and Homura are forced into a fight