Shugo Shugo! (しゅごしゅご!; Guardian Guardian!) is Shugo Chara Egg!'s 2nd single. It was released on February 25, 2009 in two editions: regular and limited. The limited edition and the first press of the regular edition came with an original trading card and a serial number card used to enter a lottery where tickets could be won to an event.
The title track was used as the 2nd opening theme for the anime Shugo Chara!! Doki—.
The single reached #14 on the Oricon charts, charted for three weeks, and sold a total of 10,899 copies. The single V reached #22 and sold 1,745 copies.