Nene is an Academy student who so desperately wanted a boyfriend that she once summoned Hanako-san from the rumours, hoping that she would fulfill her wish. But Hanako turns out to be a boy, and they spend the whole day trying ways from magazines to attract Minamoto Teru, but in vain. Then Yashiro swallows the mermaid's scale, despite Hanako's warning, hoping to bond with the boy of her dreams, but instead she transforms into a fish. After that he admits that she was selfish and Hanako makes a contract with her, eating the scale too and binding their destinies together through the curse of the mermaid, so Yashiro returns to her human form and becomes Hanako's assistant.

Yashiro became friends with Kou Minamoto and Hanako, hey often hang out together at school. Yashiro began to notice that a special bond was developing between her and Hanako and she wants to know more about his past.