Her message was pretty standard- she said she was beginning to worry about her studies, so she needs to concentrate on school.
She mentioned there were happy times, and also very difficult times in AKB48,but she is very happy that she had the experience of being in AKB48.
She will be missed indeed. But hope she enjoys pursuing her studies, and continues to try new challenges in life, and works hard to reach goals.
Gambatte Erena!