In the tranquil village of Mahoroba, time drifts lazily as two students from Ototachibana Academy, Himeko and Chikane, exist as polar opposites. Himeko, reserved and timid, contrasts sharply with the bold and graceful Chikane. United by love, their bond remains unbreakable despite adversities. When a malevolent force possesses a friend on their joint birthday, the dormant powers of lunar and solar priestesses within them awaken, vanquishing the darkness. Yet, this victory marks only the beginning of their trials as they must now defend against numerous threats, even from those they hold dear.