《女孩們X女戰士們》系列第三彈。「正義怪盜」秘密戰士美少女們，將惡人所散播的「逆反之心」取回，以守護人們的夢想以及世界和平。即使她們的活躍引人矚目，但其真面目卻是個秘密...

Kokomi, Saki, and Yotsuba are three middle schoolers and friends who lead different lifestyles. One day, they meet Kumachi, a talking teddy bear who was sent by his master named Phandy to search for the "Gyaku Jewels", a human heart source treasure that can grant wishes. Kumachi later chooses them to become Phantomirage, a Robin Hood styled phantom thieves of justice in order to fight against Reverse Police, a group of bad cops who always arrest good people by turning them into their dark selves. Phantomirage must purify their stolen hearts allowing them to become normal and return their treasure by granting their wishes.