High school student Youko Nakajima is approached by a strange man who claims he's been searching for her and that she is the rightful ruler of his kingdom.

After a young girl's mother dies she is moved from the city to the country where she accidentally meets a synthetic alien 'Figure' that takes the guise of a twin sister and begins attending school with her.

Amatsuki Meguru is a girl who innocently aspires to be a hero of justice and the cool Kisaragi Sumire who grew up in the strict Kisaragi household... The two girls who are in their 3rd year of middle school end up getting orders from a mysterious hedgehog named Miruku-chan and turn into Twin Angels in order to fight evil! Meguru is always cheerful but sometimes a bit too forceful. Meanwhile, Sumire isn’t accustomed with being around others. Despite their differences, as they work together, they start opening up to each other.