Hayato Izumi, a diligent and sensible student, enters the race for student council president but faces tough competition from the charismatic Ui Wakana. Despite his defeat, Hayato graciously accepts the position of vice president. Unexpectedly, Ui moves in with him due to a decades-old promise made by their parents in a drunken stupor, declaring that their children would marry. Now, Hayato and Ui must navigate their dual roles as students and newlyweds, concealing their relationship from judgmental peers. Together, they strive to manage the student council effectively while exploring the possibilities of happiness in their peculiar situation. Explore the comedic and heartfelt journey of Hayato and Ui in Okusama ga Seitokaichou!