In a world where only certain women can use magic, the only ones who can stand against the unknown lifeforms known as "Kaijin" are magical idols, commonly called Mahodoru. Meimei Satsukahara forms a Mahodoru unit with Erina Ninomai and Florence Yosuba, and together, they throw themselves into the battle against the Kaijin, the enemies of humanity. If they lose in battle, they not only face "lewd" consequences, but also put the citizens they are sworn to protect at risk, with their bodies becoming targets.