高橋南
On December 8, 2014, it was revealed that Yokoyama would succeed Minami Takahashi's job as the General Director of AKB48 after Takahashi's leaving. With the graduation of Minami Takahashi scheduled on April 8, 2016, she became the second "Soukantoku" on December 8, 2015 during the 10th anniversary stage of AKB48 Theater.