Amatsuki Meguru, a bright girl with dreams of becoming a hero of justice, crosses paths with the poised Kisaragi Sumire, raised in a strict household. In their final year of middle school, a peculiar hedgehog named Miruku-chan bestows upon them the titles of Twin Angels, tasking them with battling malevolence. Meguru exudes cheer with a touch of assertiveness, contrasting Sumire's reserved nature. Through their collaboration and growth, these polar opposites gradually forge a bond, learning to open up and trust each other.