"Chance no Junban" (チャンスの順番, Chansu no Junban^?, "The Order of Chance") is Japanese idol girl group AKB48's 19th single, released on December 8, 2010.

Following AKB48's July concerts at Yoyogi National Gymnasium in Tokyo, it was announced that the headlining "senbatsu" members for the 19th single would be decided in a janken (rock-paper-scissors) tournament among AKB48 members and four representatives of research students also decided by janken. The tournament was a bracketed, single knockout format with 51 members. The top 16 were given senbatsu status and participated in the single. 12 of which would be given media senbatsu members. The tournament was held at Nippon Budokan on September 21, and was won by Team K's Mayumi Uchida, who was given the center headlining position.

"Chance no Junban" was released in four different versions and cover variations, with the theater version being exclusively sold in the AKB48 theater in Akihabara, Tokyo. Versions A, K, and B contained a different third track aside from the title track and "Yoyaku shita Christmas", which was performed by one of the respective teams of AKB48. The theater version included a third track that was performed by Team Research Students. In addition to including their respective music videos, versions A, K, and B also included footages of the janken tournament that took place in Budokan in September. All first press releases was enclosed with a handshaking event ticket, to be redeemed later in national handshaking tours held across Japan in promotion of the single release.

"Chance no Junban" sold 471,242 copies in its first day, placing it on top of the Oricon daily chart, and sold 54,780 more on the second day . The single has been certified triple platinum by the RIAJ for physical sales.

...
Wikipedia