Announced at Team E performance today, SKE48's Team E's Nakamura Yuka will be graduating by the end of 2011. The reason for her graduation is to focus on her studies as she will be taking high school entrance exam in 2012.
Nakamura Yuka's profile: http://www.ske48.co.jp/profile/?id=nakamura_yuka
Nakamura Yuka's blog: http://www.ske48.co.jp/blog/?writer=nakamura_yuka
Here's what she said when she announced her own graduation:
I, Nakamura Yuka, has something I would like to tell everyone. I will be a middle school year 3 next year.I am thinking of placing priority in studying for my high school entrance exam.
I am sorry for not voicing this out earlier. I am sorry graduating just as my schedule is becoming packed this year.
I am truly sorry for being the first to graduate from Team E, but I hope you will continue to support Team E and SKE48. Even though I am graduating, I still love SKE48. I aim to be Team E's greatest fan. I will work hard to become Team E's greatest fan so everyone please work hard as well.
Nakamura Yuka is the first and only member of Team E to graduate. She joined SKE48 in 2010 during the 4th Audition on September, and was promoted to Team E on December. Her unit song in Team E 1st Stage [Shonichi] is Temodemo no Namida, taking on Saeki Mika's lines in the song. Coincidentally, Saeki Mika has also graduated.
Screenshots of the graduation announcement: