A singer-songwriter from Osaka, known for her charming "selfish voice."

Her signature song, "Tobacco", has been followed by a string of hits in recent years, including "♡My Life♡" and "Dear ex-girlfriends" She also won the Japan Record Award for Best Lyrics for the song "Super cute!", which she wrote.

On March 19, 2025, she released her 4th full album, "Atashi wo Eranda Kimi to Atashi wo Erabanakatta Kimi e," marking her first album in four years. Her nationwide tour, "Koresawa LIVE TOUR 2025 – Atashi wo Eranda Kimi to Iku Tour," kicks off in May and has already sold out in all venues. Due to high demand, an additional show has been announced—her first-ever Nippon Budokan concert, "Atashi wo Eranda Kimi to Iku Budokan," on Tuesday, September 16. In addition, she will begin an extra 10-city tour starting in October.

Koresawa never reveals her face in the media, and the only place to see her true self is at her live performances. Instead, her visual identity is represented by a bear character named "Reko-chan."