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Aika Mitsui (光井 愛佳 Mitsui Aika?, born January 12, 1993 in Ōtsu, Shiga, Japan) is a member of Hello! Project and a former member of the J-pop group Morning Musume, joining as a member of the eighth generation from the audition in Japan during December 2006. Mitsui's audition process was documented during the late 2006 episodes of Hello! Morning. She performed Ayumi Hamasaki's "Blue Bird" in round one of her audition and Morning Musume's "Furusato" and "Osaka Koi no Uta" in rounds two and three. She graduated from Morning Musume on May 18, 2012. She still remains in Hello! Project.
On December 10, 2006, she alone out of five (originally six, but Ayami Masuda dropped out) audition finalists was chosen to join Morning Musume.
An article published on December 11, 2006 revealed that Mitsui wouldn't be present in the 57th edition of Kōhaku Uta Gassen but would instead be featured in the group's 32nd single, Egao Yes Nude, which was released on February 14, 2007, following her first public appearance on the last round of the Hello! Project Winter 2007 Tours, ~Shūgetsu 10th Anniversary~ (～集結! 10th Anniversary～?), which took place between January 27, 2007 and January 28, 2007 at Saitama Super Arena. She also took part in Morning Musume's 2007 Spring Tour ~Sexy 8 Beat~.
One week after the results of Happy 8 Ki Audition were announced, Mitsui was featured in a small segment of Hello! Morning which included footage from a press conference given on the eleventh. During the conference, Mitsui revealed her goal of captivating the public by means of her cheerful personality and smile, emulating fellow member Koharu Kusumi, whom she admires and strives to equal or surpass.
Following her concert debut, Mitsui was also featured in a small segment of the Oha Suta morning programme entitled I want to express my gratitude ("ありがとうを伝えたい" Arigatō o tsutaetai?), which purports to show the viewers a fictionalized account of the events following her first concert appearances, dealing with Mitsui's sadness over the fact she had to part with her former classmates due to her becoming an idol.
On April 6, 2008, Hello! Project announced that that Mitsui would not be able to perform in the 2008 spring tour due to her being in very poor health. Later in the week, it was discovered that she had suffered from acute appendicitis, and would be out of action for two more weeks.
In December, Mitsui's 1st Solo DVD titled 'Mittsi' and Photobook 'Aika' were both announced to be released in January.
Between December 15, 2010 (the graduation of Linlin) and January 2, 2011 (the addition of Mizuki Fukumura, Erina Ikuta, Riho Sayashi and Kanon Suzuki), Mitsui was the only member of Morning Musume under the age of 20.
She was injured in the Spring 2011 during the last few dates of Morning Musume's Fantasy DX concert tour. She suffered a fracture to her ankle which put her out of concert action. She continued to participate in live performances sitting on a stool. Mid 2011 it was announced that her injury had become worse. She was ordered bed rest by the doctor. She took part in Morning Musume's 47th Single, but did not appear in the dance shot accompanying the single. Aika did not participate in the 2011 Morning Musume fall concert until the final day on September 30, when Ai Takahashi graduated from the group. However, she was featured in all of the concert goods that were released.
On the 4th of May, 2012, Mitsui announced that she would graduate from Morning Musume along with the current leader, Risa Niigaki, on the 18th of the same month. This was due to her ankle injury which put her on hiatus since spring the previous year. A few days beforehand she had been diagnosed with abnormal bone structure and may irritate her injury if she continued doing the strenuous exercises her profession put her through. Mitsui will be the first to leave a group, but not Hello! Project since the Elder Club graduated in 2009.