Guardians 4 was formed in early 2009. The final episode of Shugo Chara! Party aired March 27, 2010, effectively ending the group's activities. The group officially disbanded after performing Arigatou ~Ookiku Kansha~ with Shugo Chara Egg! and Buono!. In 2013, the group briefly reunited to perform "PARTY TIME" at the Hello! Project COUNTDOWN PARTY 2013 ~GOOD BYE & HELLO!~.