From Me to You (2005–2006)

Upon leaving her hometown in Fukuoka for Tokyo, Yui wrote the song "Feel My Soul" as a tribute to her hometown. Although she initially had planned its release on an indie label, Fuji Television producer Mr. Yamaguchi was so inspired by Yui's voice that he insisted on having her work on the music for his primetime drama Fukigen na Gene even before she released her first major single. The music in Fukigen na Gene was eventually based on her songs "Feel My Soul" and "It's Happy Line".

On February 23, Yui released her first major debut single "Feel My Soul". With the publicity the drama tie-in drew in, "Feel My Soul" managed to sell over 100,000 copies and managed to chart at number 8 on Oricon Weekly Charts in its first week. Her next three singles, "Tomorrow's Way" (theme song for the movie Hinokio), "Life" (5th ending theme for the Bleach anime), and "Tokyo" did not chart as high as "Feel My Soul", and were only moderately successful in comparison.

After the release of four singles, Yui released her debut album, titled From Me to You, a moderate success with sales of more than 200,000 copies.