Arima Emiri is a Japanese lyricist born on March 7, 1999. Influenced by her British musician father, she began playing piano at age five and later served as a shout vocalist in a metal band from age fifteen. Inspired by the idol group LADYBABY in 2018, she decided to pursue a professional songwriting career. While studying songwriting, composition, music theory, and DTM at a vocational school, she began working as a lyricist.

In 2021, she joined the group PassCode as the shout vocalist and performed at the Nippon Budokan within six months of joining. She also contributes to music magazines. Known for writing realistic lyrics that reflect the perspective of her generation, she excels in expressive, age-true lyricism for teens and young adults, as well as in crafting cool rap-infused works and bright, cute pop lyrics.