Guardians 4 (ガーディアンズ4) is a Japanese pop girl group managed by Up-Front Agency and part of Hello! Project. The unit was made mainly to promote the Shugo Chara! anime series, alongside groups such as Buono! and Shugo Chara Egg!. They are known for their distinct school uniform costume, which changes color with every new single.
- Mitsui Aika (光井愛佳) (Morning Musume)
- Kumai Yurina (熊井友理奈) (Berryz Kobo)
- Nakajima Saki (中島早貴) (°C-ute)
- Sugaya Risako (菅谷梨沙子) (Berryz Kobo)
- [2009.05.27] Omakase♪Guardian (おまかせ♪ガーディアン)
- [2009.09.02] School Days
- [2009.11.18] PARTY TIME / Watashi no Tamago (PARTY TIME / わたしのたまご) (Guardians 4 / Shugo Chara Egg!)
- [2010.01.20] Going On!
Compilations / Other
- [2009.12.02] Hello! Project - Petit Best 10 (#11 Omakase♪Guardian)
- [2010.03.10] Guardians 4, Shugo Chara Egg!, Buono! - Shugo Chara! Song♪Best (#2 Going On!, #4 PARTY TIME, #6 School Days, #8 Omakase♪Guardian, #13 Arigatou ~Ookiku Kansha!~ - Guardians 4, Shugo Chara Egg!, Buono!)
- [2010.12.15] Hello! Project - Petit Best 11 (#8 Going On!)
- [2013.12.31] Hello! Project - Hello! Project no Zenkyoku Kara Atsumechaimashita! Vol. 1 (#10 PARTY TIME)
- [2010.03.17] Shugo Chara! Clip♪Best (Guardians 4, Shugo Chara Egg!, Buono!)