the Japan Hot 100, becoming her lowest charting single. With strong label backing, however, the album peaked at #2 and was beat only by the successful 7th album by legendary pop-star Kumi Koda. Rainbow went on to sell nearly 100,000 copies and become certified gold by the Recording Industry Association of Japan. Fukuhara later embarked on the successful Rainbow Tour 2009, which spanned six shows in multiple cities. She performed a mix of covers, original songs from Rainbow, and b-sides. Following her album, she released her next single "Hanabi Sky" in June 2009. It was another major airplay hit, peaking at number 3. Overall, the single peaked at number 5, but only received number 26 for sales. She quickly announced her next single, "Let It Out", second ending theme to popular anime Fullmetal Alchemist: Brotherhood in early July. "Let It Out" is both Fukuhara's first major anime tie-in and her first single to be released in 3 separate formats, and was released on September 9, 2009. While it was a much bigger hit than "Hanabi Sky", it still fared relatively poorly in terms of both physical and digital sales in comparison to her previous singles "Love (Winter Song)", "Change" and "Yasashii Aka". Leading up to the release of her second studio album Music Is My Life (2010), Fukuhara released the singles "Nande Nakitaku Nacchau n Darō" (2009), "Mirai" (2010) and "Moshikashite" (2010). In 2010, Fukuhara began releasing conceptual extended plays. The first, Regrets of Love, featured ballads, while the second two in 2011, The Soul Extreme EP and The Soul Extreme EP II, featured soul and R&B music. The leading track of The Soul Extreme EP, "O2", featured R&B singer Ai, and became a commercial success, with her record label tracking 300,000 legal downloads of the song. In 2012, Fukuhara debuted as an actress on the musical comedy Kaeru no Ojōsama as Minami Haneda, a member of a singing group called Chansons. As a member of the cast, Fukuhara performed music throughout the series. Fukuhara's third album The Best of Soul Extreme was released in June 2012, led by the single "Dream On" featuring Daichi Miura. The album featured a second duet with Ai, as well as a song performed with Leona Lewis. Parting with Sony In early 2013, it was announced that Fukuhara signed on to be the newest frontwoman of the worldwide pop music project Sweetbox along with