Tập 27: Công chúa cá nhân Nam Cực Caren tự giới thiệu với Rina

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The purple mermaid from the previous episode introduces herself as Caren, the mermaid princess of the Antarctic Ocean, and the younger twin sister of Noel, the mermaid princess of the Arctic Ocean, whom Rina was with when she was captured. Later, Rina experiences a guilt trip as she remembers how she was forced to abandon her friend when Gaito attacked. The Black Beauty Sisters are introduced. (Source: Wikipedia)