Miwa was born in Hayama, Kanagawa, however moved to Tokyo at a young age. Since her father had a great love for a music, miwa naturally began to enjoy music as she grew up.

miwa began writing songs at 15. She started self-learning how to play the guitar after she entered high school, but gave up and paid for professional lessons after finding she could not make a lot of progress learning by herself. Her high school had a ban on students having part-time jobs. Despite this, miwa secretly worked, and eventually used these savings by her second year of high school to buy a Gibson J-45 guitar. After this, miwa played live concerts mostly around Shimokitazawa in Tokyo and in Okinawa in the summer (her parents had a house there). Due to her high school also having a ban on students working in the entertainment business, she had to do these lives in secret (without even telling her school friends). In this time, miwa released two self-published independent singles, "Song for You/Today" and "Soba ni Itai Kara" in 2007 and 2008.

miwa was signed to Sony Music Entertainment Japan during her third year of high school. She debuted as an artist in 2010, while attending Keio University. Her debut single, "Don't Cry Anymore," was chosen to be used for the drama Nakanai to Kimeta Hi's theme song. The single was a minor commercial success, breaking the top 20 on Oricon's single charts and being certified by the RIAJ as selling 100,000 full length cellphone downloads a month after its release. In April 2010, the song won the award for best drama theme song at the 64th The Television Drama Academy Awards, beating out songs such as Arashi's "Troublemaker" and Mr. Children's "Hanabi.

miwa released her second single, "Little Girl," in late June. Her third single, "Change," was the twelfth opening theme song for the Bleach anime, and was a top 10 single.

For the animated film adaptation of Eto Mori's novel Colorful, miwa covered two songs by famous Japanese artists. Yutaka Ozaki's "Boku ga Boku de Aru Tame ni" was used as the film's image song, and The Blue Hearts' song "Aozora" was used as the ending theme song of the film. Both songs were released as digital downloads on August 12, 2010.

miwa considers her favorite Western musicians to be Sheryl Crow, Deep Purple, Carole King, Avril Lavigne and Taylor Swift. Her favorite Japanese musicians are Aiko, Angela Aki, Radwimps and Yuki.

miwa previously been a DJ on monthly radio show on All Night Nippon, miwa no All Night Nippon R (miwaのオールナイトニッポンR), every third Monday from 3:00am to 5:00am. It has since then been changed into a weekly show, now known as miwa no All Night Nippon (miwaのオールナイトニッポン), airing every Tuesday (early Wednesday) from 1:00am to 3:00am.

miwa released her first album Guitarissimo on April 6, 2011 (was scheduled to release a week earlier on end of March but was delayed due to the Tōhoku earthquake and tsunamiand its aftereffects). The charts performance was miwa's best overall: the album reached No. 1 in the Oricon's album charts, making miwa the first Heisei period-born solo singer to reach a No. 1 on the album charts in the history of the Oricon

Yui (ユイ^?, born March 26, 1987), stylized as YUI, is a Japanese singer-songwriter, multi-instrumentalist, composer, actress and radio personality. Born and raised in Fukuoka prefecture, she played live at various locations in her hometown before being noticed by Sony Music Japan when she was 17 years old and released her debut single months later. However her singles were only met with moderate success until her breakout "Good-bye Days", which charted for 44 weeks on Oricon and marked her as one of the Japanese music industry's rising stars.

Since her debut album, From Me to You, each of her albums has topped the charts, and has had at least one single reach number one yearly since 2007, including five straight from mid-2008 to late-2010.

She is popular in Japan and in surrounding countries, ranking number one in 2011 Count Down TV "Dearest Female Artist" and Music Station "Artist You Most Want to Marry" polls, as well as Radio Television Hong Kong's "Most Popular Japanese Artist

YUI began writing poems in ninth grade. At the age of 16, by recommendation of a friend, she began studying singing, songwriting, and guitar at a private music school in her hometown in Fukuoka. Aspiring to become professional, she carried her guitar around and performed at local areas like the seashore of Shingu and the middle of Kaminofu's rice fields.

In March 2003, at an audition hosted by Sony Music Japan, all of the judges evaluated her with the highest score, which caused a fierce scramble among labels. At this audition, she sang three songs: "Why me" (which was later coupled with her debut single), "It's happy line", and "I know" - though the audition rules stated that a participant could only sing two songs. Sitting cross-legged on the floor, she strummed her guitar and sang. The judges and the others present at the audition claimed that "the performance created a tremendous aura from her heavenly voice, and captured the hearts of the whole audience". "It's happy line" was then released as an indie single in December 2004, with "I know" as the second track.

Upon leaving Fukuoka for Tokyo, YUI wrote the song "feel my soul". She was planning to release it on an indie label as a tribute to her hometown, when the song caught the ears of Fuji TV producer, Mr. Yamaguchi, who happened to see the demo video clip. He claimed YUI's voice haunted him so much that he went out of his way