![](https://cdn.animecharacters.io/images/characters/large/60648-308b57ce.jpg)
Sayu Hisanuma (久沼 さゆ)
A third grade elementary school girl with brown haired pigtails and eyes. She is Miuna's best friend who often instigates confrontations with sea people.
A third grade elementary school girl with brown haired pigtails and eyes. She is Miuna's best friend who often instigates confrontations with sea people.