As a new student in fifth grade, Amu Hinamori has developed a reputation as a stylish, resilient, and independent individual. Although she seems aloof both in school and at home, her tough exterior is really just a subconscious act. With the help of her guardian characters, Amu is determined to fight against the Easter Company's quest to steal people's eggs and find the elusive Embryo, which is responsible for creating X Eggs & X Characters.