After the disappearance of the original squad, Miruku-chan, a hedgehog with an enigmatic persona, urges two third-year students to take up the mantle of Twin Angels. Meguru Amatsuki, who is cheerful but forceful, dreams of becoming a champion of justice. Sumire Kisaragi, an introvert with a composed demeanor, grew up in a rigid household. Despite their contrasting personalities, they begin to bond as they collaborate as Twin Angels, attempting to thwart Mary's nefarious plans to revive Zelucifer, the demonic ruler.