Earlier in July, tokyohive reported that Ono Erena of AKB 48 will leave the group to study abroad, and it's been announced the day for Erena to graduate from AKB48 will be September 27th.

On AKB48's official blog, Erena's message to fans was posted on the 19th, and below is what she wrote:

"I have received many messages by fans since I announced my graduation at concert in July. �It was very warm, and I'm full of gratitude. �I will go abroad in October once to find where to live, and also to check out the school. �Therefore, my activities as AKB48 member will end after the performance on September 27th. �I am very sad not to be a member of AKB48 anymore, but I decided it thinking deeply. �I will come back to Japan as much better someday. �There will be a photobook and DVD of my graduation anniversary, so please look forward for it. �Thank you very much to everybody who supported Ono Erena of AKB48. �I will do my best as AKB48 until the end, please continue to support me!"

Source: natalie + AKB 48 Official Blog