Ep. 1: Mamori Tokonome and Mirei Shikishima battle Liberators on Mermaid Island

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Mamori Tokonome, diagnosed with a bodily irregularity, is captured and taken to the remote island of Mermaid. There, she is attacked by Miyasato and Kouzuki, who transform into a Liberator Arm. Mirei Shikishima arrives and transforms Mamori into a sword Liberator Arm, enabling them to defeat their attackers and flee into the jungle. They reach a white castle and are trapped in a coliseum, where they face another Liberator named Saejima. Saejima employs a masochistic slave girl to activate a ball-and-chain Liberator Arm. Cornered, Mirei utilizes arousal to transform Mamori into the sword Liberator Arm once more, allowing her to instantly defeat Saejima and secure their escape.