In her second year of junior high school, she started to like anime. She was impressed by Kana Hanazawa portrayal of the main character in Kobato. This inspired her to become a voice actress as well.
In 2016, she participated in an audition held by Sony Music Artists. She applied as singer because she felt she wasn't experienced enough as voice actress. She won a special price at the competition.
In 2017, she made her voice actor debut as a minor character in "Eromanga Sensei". In June 2017, she was cast in her first main role as Kirara in the Kirara Fantasia.
On April 15, 2018, her fanclub named "TOMOROOM" was opened.
On March 9, 2019, she won the Best Rookie Actresses award at the 13th Seiyu Award.
Some of Tomori's other roles include:
- Her nickname is Tomoriru.
- Her talents are playing the trumpet and painting.
- Her hobbies are songwriting, listening to music, visiting art supply stores, gaming and surfing the internet.