The entire premise hangs on one drunk parent agreement, and instead of running from it, Hayato ends up genuinely attracted to someone who has zero shame about what she wants. She barges into his life throwing condoms at a school assembly, and somehow that confidence makes her impossible to resist. By the time you realize this is less about the contract and more about two people who actually want each other, the show has already won.

Izumi Hayato's campaign for student council president collapses when a charismatic girl named Ui Wakana wins the election by promising romantic freedom and tossing condoms into the crowd. Stuck as vice president, Hayato gets another surprise when Ui turns up at his home with news: years ago, when the two were only three, their parents agreed over drinks that she would become his wife, and now she plans to move in as exactly that. After some hesitation, Hayato goes along with the arrangement. The two now have to figure out how to share a home while hiding their unusual marriage from everyone at school, including fellow council members Karen Fujisaki and Ayane Niikura. The result is a short-format romantic comedy with a heavy ecchi streak.