Guardians 4 (ガーディアンズ4) was a Hello! Project unit put together to sing new opening themes for the anime Shugo Chara!! Doki. The unit consists of Aika Mitsui (光井愛佳) of Morning Musume, Yurina Kumai (熊井友理奈) and Sugaya Risako (菅谷梨沙子) of Berryz Koubou, and Nakajima Saki (中島早貴) of °C-ute.
