She mostly always wear her Kimono everywhere she goes, from the trip to the publisher's to the gang's trip to the beach. She has a timid personality, although this seemingly cold state has been broken many times.
A fellow light novel writer with Masamune, although she is much more successful than him. She is left handed and prefers writing her manuscripts by hand rather than by computers. People pass around rumors that Masamune had copied her writing style.
It's revealed later in the story that she actually is Masamune's biggest fan, and sent Masamune his first fanmails. Her reason of writing light novels is due to her love for 「The silver wolf's reincarnation」that Masamune wrote, she began writing her own fighting-style novels while waiting for Masamune's new volumes of his novels.

It is also revealed later in the story that she has a crush on Masamune. Obviously, Sagiri isn't very glad about this.

Her real name is Umezono Hana (梅園 花).