SDN48 (short for Saturdaynight48) was a Japanese Idol Group produced by Akimoto Yasushi. They were known to be the "mature version" of AKB48, only with members aged 20 or above. The group shared a theater with AKB48, in Don Quixote, on Akihabara (Tokyo Prefecture). The debut single of the group, GAGAGA, was released on November 24, 2010. On March 31, 2012, all the members graduated from the group.