The story is about the innocent girl Amezuki Kai who dreams of becoming a righteous partner and the cold-blooded lady Kisaragi Sumire who grew up in the strict Kisaragi family. The two junior high school girls met a little mouse named "Milk Sauce" and transformed into thief angels to fight against evil forces silently. The two girls, one cheerful and the other not good at socializing, are completely different and build a girl-like relationship through joint actions. (Excerpt from B station)