Ai Otsuka (Da Zhong  Ai , Otsuka Ai, born September 9, 1982) is a Japanese singer-songwriter from Suminoe-ku, Osaka, Japan. She is a popular artist on the Avex Trax label and is best known for her 2003 hit "Sakuranbo," which stayed in the Top 200 Oricon Weekly Singles Chart for 103 weeks. A piano player since age four, Otsuka composes and co-produces her own songs, as well as writes her own lyrics. Her music ranges from upbeat pop/rock music to ballads.

On April 11, 2007 Otsuka released a new single, "Love no Theme," as the self-created bunny rabbit character "Love-chan". "Love no Theme" was sung on her Jam Punch Tour 2005. Before its release, it was titled I canChu before it was changed to "Love no Theme". The "Love no Theme" single included a preview of a new single featuring Love, titled "White Choco." This song could only be found previously on the promotional CD released before "Momo no Hanabira". "Love no Theme" unfortunately did not sell as well as Otsuka's normal singles.  Otsuka released her first single after Ai am Best, "Peach/Heart" on July 25, 2007. The first A-side "Peach" is an up-beat summer song and was used as the end theme for the summer drama Hanazakari no Kimitachi E (starring Maki Horikita and Shun Oguri), while the second "Heart" is a mid-tempo track. The single also includes a rearranged version of "Renai Shashin", titled "Renai Shashin -Haru-" (Lian Ai Xie Zhen  -Chun -, Love Photograph -Spring-).  On September 26, 2007, Otsuka released two CDs and a DVD. The first CD was Otsuka's fourth original album, titled Love Piece. This included all of her singles from "Frienger" to "Peach/Heart", with five new songs on an 11-track album. The album was released in CD+DVD and CD-only formats, with the DVD including a music video of "Heart" and "Kumuriuta" (kumuriuta), a song from the album. The first-press of the DVD also includes the PV of "U-Boat," while the first-press of the CD-only version comes with a 40-page color photobook. The second CD was a limited pressing re-release of the best album "Ai am Best" in CD-only format.  Also on September 26, Otsuka released a DVD of her Ai am Best Tour 2007, recorded at the Tokyo International Forum Hall A on July 9, 2007. The DVD is available in a single-disc edition, as well as a special two-disc edition with outtakes of the tour. The first-press of the special edition comes with a 40-page photobook.  Otsuka performed at Makuhari Messe on July 7, 2007, for one of Japan's two Live Earth concerts, alongside contemporaries Kumi Koda and Ayaka.

Did she tour any where else?