What do an alien, former ninja, weak telepath, and boy pretending to be a girl have in common? They are all classmates at Kashihara Girls' Academy, and they hide their true identities from the world. Rikka, Chiyo, Sekine, and Tsubasa seem like the best of friends, but they each harbor a monumental secret that they cannot reveal, no matter what. In order to continue masquerading as normal middle school girls, each of them must invent creative ways to conceal their true selves. But that is easier said than done, as the four students end up entangled in numerous shenanigans along the way.

Inako is a minor country, enclosed by two superior countries: the militaristic Milidonia, with its goal of conquering as much land as possible, and the monotheiestic Selenfalen, devoted to the deity Saint Philia. Ani Inako is the sole princess of her country, and in order to eliminate hostility between the three countries, she is sent as Inako's representative to a peace treaty signing in Selenfalen. However, Ani's hopes of a smooth ceremony are shattered when she meets the eccentric princes from her rival countries. With the treaty binding the three countries together, Ani and the princes must learn to overcome their differences. Together, they search for common ground on which to develop their friendship.

Far away from the reaches of demons and war, near the borderland of Zoltan, D-Rank adventurer Red lives a normal existence. Through perseverance and hard work, his dream of starting his own apothecary and peaceful life in the countryside finally came true. Abruptly, Red gets a live-in partner and assistant named Rit—the princess of Duchy Loggervia and an adventurer herself—who gives everything up to join him. Although honest, kind, and loved by all, Red has a secret shared only with Rit: his real name is Gideon, brother of Ruti Ragnason, the "Hero" and a former member of her party. Ares Drowa, the "Sage," kicked Red out of their party after their war against the Demon Lord after deciding he was weak and insignificant. Now, even though Red has left the Hero's party behind by assuming a new life together with Rit, his past has yet to let go of him.