Natsu has a very cute face and is the idol of her school. She has short, shoulder length blond hair and has large round eyes. During tennis matches, she is often seen tying her hair up into a ponytail.
Natsu has a very frank and friendly personality. She plays tennis because she finds it fun and aims to become a professional player.
Natsu is a very skilled all-round player who is one of the top seeds in female tennis tournaments. Unlike Eiichiro who plays in technical and logical manner, Natsu relies on her instincts to determine her next attack. According to Ei-chan, she also has good hand-eye coordination.
She also has a good eye for searching for strong players. When she says that someone is 'super strong', they have what it takes to become a pro even though that person does not look like one.
Natsu meets Eiichiro for the first time when she borrows his World History notes, after her friend introduces him to her. As the story progresses, she gets really close to Eiichiro having thought that he had become a good tennis player. She also admires him for trying his best at tennis. She develops a crush on Ei-chan very early on in the series but she does not have the courage to tell him yet. She only tells this to Takuma after Takuma asks her in the text.  Before the start of Kanto Junior Tennis Tournament, she confesses her feelings for him at the beach and starts going out with him. They have met each other's parents and has a good relationship since then. They also go on dates during their free time and has kissed a few times, the first was before Eiichiro's match against Kanda.
Natsu and Ike are childhood friends. She was the one who introduced tennis to Ike, starting off his road to becoming a pro tennis player. It is mentioned that she wants to be a pro to catch up to Ike who is shining on the world stage. As Ike's childhood friend, she is very understanding of Ike's personality and often asks him to do her favors in regards to helping Eiichiro.
|Anonymous||6-0||Win||Kanagawa Junior Tennis Circuit||n/a|
|Megumi Nakajou||4-6 7-5 6-1||Win||All-Japan Junior Indoor Selectionals, Kantou Preliminaries||n/a|
|Eiichiro Maruo||1-6||Lose||Friendly Match||n/a|
|Sakurai Rei||6-1 6-0 (manga) |
6-2 6-0 (anime)
|Win||Kanagawa Junior Tennis Circuit Year 3||Finals|
- Likes ice cream, dogs, cabbage, taking a bath, sleeping and eating