My Wife is the Student Council President!+

Izumi Hayato runs for student council president, but loses to a charismatic candidate who promises to liberalize school rules. The new president, a beautiful girl, moves into Izumi's house and announces that she and Izumi are to be married due to an agreement made between their parents when they were three years old. This was arranged in exchange for alcohol, setting the stage for Izumi's unexpected life changes.