Sayu Hisanuma

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.

[Spoiler] After the time-skip, she entered the same middle school as Hikari and the others. She also decided to be more serious at studying and becoming independent. [/Spoiler]

[Spoiler] She has a crush on Kaname. [/Spoiler]