 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 May 4, 2012, Mitsui announced that she would graduate from Morning Musume along with the current leader, Risa Niigaki, on the 18th of the same month.