Oribe took piano lessons starting at age three, and later took dance and vocal lessons, which continued through her junior high school years. While in elementary, she participated in an audition held at the Nippon Budokan, and it was during this time she decided to become an artist. In junior high school, she formed a band which covered songs by Avril Lavigne, Love Psychedelico, and Ego-Wrappin'. Oribe began her singing career in 2005 during her first year in high school when she formed a cover band playing indie rock band called Chucky. She chose not to attend university to focus on her work with Chucky, but it eventually became difficult for them to continue performing.
Following the band's disbandment in July 2008, she moved to Tokyo in order to continue her singing career. In Tokyo Oribe formed the band Love is Same All with members from the indie band Parking Out and began using the stage name LiSA, which is an acronym for Love is Same All. LiSA made her solo debut on April 20, 2011, with the release of the mini-album Letters to U by Aniplex under Sony Music Artists. The songs on the album were composed by dōjin and major artists, and she composed the first song "Believe in Myself"; she wrote the album's lyrics. On November 12, 2011, she appeared at the Anime Festival Asia in Singapore. She released her first solo single "Oath Sign" on November 23, 2011, which was used as the opening theme to the 2011 anime series Fate/Zero.