Tachibana Shota is third year student coming out of a pathetic break-up who wants to enjoy his summer break and forget about his ex-girlfriend, Watanabe Chigusa. Staying out late at an arcade, he stumbles across a drunk Hanazono Mayuri who has nowhere to return to. He ends up bringing her home and a series of events leads to a hasty marriage. Going back to school after getting married, Shota's ex-girlfriend demands they get back together and live together. However, when his Wife and Ex-Girlfriend meet and sparks fly, what is Shota to do when his wife is his ex's mother?