"Shock!" is the eleventh major single by Japaneseidolpop group Cute. It was released on January 6, 2010, in both normal and limited editions, the limited edition containing a DVD with a version of the "Shock!" PV on it and coming with a different cover. The first press of each edition also contained a card with a serial number on it, used in an event draw to promote the single's release. This was the first single to be released after Erika Umeda's graduation, which also makes it the first single not to feature her. Airi Suzuki is "centred" in this single, taking on the main vocals. The single peaked at #1 on the Oricon daily charts, and #5 on the weekly charts. The single also reached #13 on the monthly chart for January, with a reported total of 23,389 copies sold.