Nao possesses qualities such as beauty, intelligence, and impressive swimming skills. She has a deep affection for Haruka, whom she considers her closest friend and confidante since childhood. When it seemed that they would be separated forever, Nao was deeply saddened. Despite being mature and compassionate, Nao's love for Haruka is more intimate and sensual than what she shows to others. On the other hand, Sora harbors strong resentment towards Haruka but has never expressed her reasons clearly.