You're Also A Mermaid

On the day of her mission to kill her friends, she couldn’t do it and had informed them of her true nature. Her friends were shocked but then they also informed them about their true nature, however, they told her why they had to keep theirs hidden, it was not to hide but to protect their families and they had laws to follow. Paula wanted to hate them because they had befriended her and kept their true natures to themselves, but then when she also thought about her secret as well she then understood that they must have felt the same way as she did.