Following the defeat of the Easter Corporation, Amu Hinamori and the Seiyo Academy Guardians resume their duty of cleansing X Eggs. With most members graduating soon, the future of the Guardians Council is uncertain. To secure its continuity, the team enlists two Guardian Apprentices, including the spirited Rikka Hiiragi, who possesses the unique talent of communicating with X Eggs. While her skill captivates the Guardians, Rikka harbors doubts about being fully embraced if her secret is revealed.