My Wife is the Student Council President!

Izumi Hayato runs for president of the student council at the start of the narrative. But when a stunning woman enters, vowing to liberalize love while tossing condoms into the crowd, he loses to her and is elected vice president. The freshly elected president of the student council invites herself to Izumi's home after the meeting, where she immediately reveals she would marry Izumi due to an arrangement their parents made when they were only three years old, which was made possible by alcohol.