Over a century ago, astral mages under persecution from the Empire banded together and established the Nebulis Sovereignty under three founding families: Lou, Hydra, and Zoa. With the leadership of Millavair Lou Nebulis VIII, the Sovereignty aims to minimize casualties in their conflict with the Empire—a stance the extremist Zoas disagree with. Tensions rise between the families as the upcoming election to decide the next leader approaches. The Zoas are willing to do anything to achieve success; however, a world-ending war may ensue should they be victorious. Princess Aliceliese "Alice" Lou Nebulis XI has no choice but to cooperate with any potential allies in order to advance towards her ultimate goal of ending the conflict that has long tormented everyone involved. This includes Iska—one of the Empire's greatest warriors and her greatest rival.

A boy and a girl pledge lifelong friendship in a small town junior high school. The relationship between the two, who are destined to share a common dream, has passed two years without any particular development. Himari Inuzuka, a bubbly girl who has yet to find her first love, and Yuu Natsume, a plant-loving boy who enjoys flowers, still spend their days peacefully as best friends in the gardening club in the second year of high school. "If Yuu can't get married, I have to take responsibility." "I'm having trouble now because after Himari said that, your brother began calling me 'My brother-in-law!'" However, when Yuu reunites with his first crush, the gears of their relationship suddenly go out of sync! Will Himari be able to escape her "ideal friend" now that she has found love?

Movie commemorating the franchise's tenth anniversary.

Under the tutelage of the great demon warlock Romberg, Ike grew up with knowledge regarding an ancient advanced civilization that once ruled the land. Coupled with his innate talent in magical arts, this upbringing allows Ike to quickly rise in the Demon Lord's army ranks, leading his brigade to consecutive victories against humans. However, Ike has a secret—he is a human himself. Despite knowing all too well the consequences if this information is ever to leak, Ike is willing to face such immense danger to achieve his goal: find a way for humans and demons to coexist and stop the war that has been carried on for far too long.