Gachikoi Maou-sama

A hero embarks on a quest to vanquish the Demon Lord in order to restore peace. Upon reaching the Demon Lord's fortress, he is met by the Demon Lord, who presents him with a marriage contract and proposes. The hero becomes wary of her intentions. The story explores the dynamic between the surprised hero and the affectionate Demon Lord, as they navigate their unusual relationship while the world's future remains uncertain.