SDN48 who disbanded in March 2012 made a surprise appearance at AKB48's Request Hour after their song, Kodoku na Runner ranked in at no. 18.
Below is the performance.
http://v.youku.com/v_show/id_XNTA3NjM3NzQw.html
SDN48 MC
http://v.youku.com/v_show/id_XNTA3NjM4ODE2.html
During the MC, SDN48 announced that they are going to have a reunion concert for their fans as promised on 31st March 2013 at the AKB48 Theatre.
Source:
SmilingSmling
Woww I was sooo surprised but happy to see SDN48 still rank in Request Hour. And yayy theater revival performance!!
P.S. sorry I can't embed youku properly again :(