Birthday: April 3
Zodiac: Aries

Futaba Ooki is the story's second protagonist. Her nickname was given to her by Hikari. She is a student at Yumegaoka High School and is in year 1, class 2. She is withdrawn, shy, and easily nervous in front of people. She got a moped license and commutes to school via a scooter. She loves to take photographs with her mobile phone and safe-keep them as precious memories. She joined the diving club through Pikari's invitation.