[4] In December 2009, while attending Hyogo Prefectural Itami Nishi High School, Arimura auditioned for FLaMme and passed.

[5] Arimura then appeared as the lead actress in the critically acclaimed film Flying Colors where she was cast as a troubled teen who attends a cram school at the behest of her mother in order to gain entry to University.

For her role in the drama, she was voted as the Best Actress in The 94th Television Drama Academy Awards (2017), an award given quarterly by a popular Japanese magazine, The Television, and are based on the combined results of votes from the magazine readers, juries, and TV journalists in Japan.

[7] She has since appeared in many critically acclaimed television dramas and films such as Meet Me After School, I Am a Hero, Cafe Funiculi Funicula and Sekigahara.

In the film Sekigahara, Arimura played the role of a ninja named Hatsume who was recruited by the legendary samurai Ishida Mitsunari.

In the drama Meet Me After School, Arimura took on the challenging role of a young teacher who ended up falling in love with her 15 year-old student.

Arimura portrayed Yukishiro Tomoe, the deceased-wife of the titular character Himura Kenshin.

Also In 2022, Arimura appeared alongside Ninomiya Kazunari in the TV Special Adventure of Comandante Cappellini (Sensuikan Cappellini-go no Bouken) and starred in the drama Ishiko and Haneo.