When the original team goes missing, a mysterious hedgehog named Miruku-chan requests two 3rd year middle schoolers to become the new Twin Angels. The cheerful yet forceful Meguru Amatsuki innocently aspires to be a hero of justice. The cool-headed introvert Sumire Kisaragi grew up in a strict household. Despite their differences, they start opening up to each other as they work as Twin Angels to stop the villainous Mary from resurrecting the demon lord Zelucifer.
Summary taken from: MyAnimeList