My first impression of Natsumi is that she's really not very nice, after being so mean and snubbing Yuusuke.

Natsumi is the star of the Swimming Club, and is well-liked and popular. Yuusuke has a big crush on her and would do anything for her, but she doesn't like him much thinking that he's just some hentai classmate who's always watching and spying on her. She also has a boyfriend named Kaie.

Natsumi's is tortured by memories of her older brother Fuyuki, since she saw him fly away with a pair of wings. She's also connected to a pair of children's red shoes.