NMB48's official homepage reports�that 2nd Generation Kenkyuusei Otani Riko (15) will graduate from the group in order to concentrate on entrance exams for senior high school.

Otani is in�third year of middle school. �She has been busy with both school and NMB48 activities. As much as she wants to continue doing both, she has decided that she wants to focus on her studies and attend high school.

Riko's graduation performance will be held at NMB48's theater house in Osaka on January 11, 2012.

Just recently on December 22nd, 2nd Generation Kenkyuusei member Takiyama Akane (17) also graduated for the same reasons.

Source: Nikkan Sports