Gender: Female
Age: 18-19 (Manga), 20 (Anime)
Hair Color: Dark Blue
Eye Color: Purple
Affiliation: Grand Blue, Peek a Boo, Oumi Women's University, Tinkerbell (Former)
Occupation: University Student

Aina is a first year at Oumi Women's University. She joins Grand Blue Diving Club after getting to know Iori and Kouhei. She is a really shy girl and hates having to expose her skin. She soon becomes good friends with Chisa.