Ep. 5: Las fuerzas de Towa obligan a Sawa a consumir carne de sirena antes de su muerte y ordenan quemar la tumba

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To save Mana's life, Sawa takes Towa to the mermaid's tomb. Yuta follows and warns Towa that eating mermaid flesh may completely transform her into a Deformed One. Towa says immortality or transformation makes no difference, and tries to force Sawa to eat a piece of mermaid flesh. She explains that when they were young, Sawa desired immortality, but was too afraid to try it herself and experimented on Towa, her identical twin. Towa developed a Deformed hand and remained eternally youthful instead. While Towa was forced to live in confinement, Sawa lived a full life, marrying and having a child. Towa tries to make Sawa eat the mermaid flesh, to become immortal as an old woman or a monster, however Sawa dies of a heart attack, denying Towa her revenge. Towa instructs the others to burn the tomb, the house, and everything in them, including herself. As they watch the fire burn, Shiina reveals that he had tried to convince Towa to elope with him when he was young, but Towa refused, remaining to exact revenge on her sister. Later, Mana reassures Yuta that if they were separated, she would eternally search for him. (Source: Wikipedia)