Yuko Oshima
On August 15 the group released its fourth album, "1830m", and on August 24 (the first day of its Tokyo Dome concert series) AKB48 announced a reorganization of its teams. Team 4 was dissolved, with its members transferred to the other three teams. Aika Ōta was transferred to HKT48, Aki Takajō and Haruka Nakagawa to Jakarta-based JKT48 and Sae Miyazawa and Mariya Suzuki to SNH48. Minami Takahashi became general manager of AKB48, with Mariko Shinoda replacing her as Team A captain. Yuko Oshima became Team K captain, and Ayaka Umeda captain of Team B.