川原恭一郎（舘ひろし饰）是位年近中年的公司职员，处事奉行中庸原则，属于可有可无的角色。在家里，宝贝女儿小梅（新垣结衣饰）对他的态度也是不冷不热的，恭一郎很是苦恼，却不知道如何改善两人的关系。 一次，两人乘坐的电车突然遇上了事故，两人在医院醒来后，竟然发现彼此交换了身体！ 由于怎么也找不到变回去的方法，无奈的两人只好代替对方扮演起学生/职员的角色，其间麻烦无数，尴尬不断，爸爸更是与小梅暗恋的学长（加藤成亮饰）“斗智斗勇”，小梅则一改爸爸往日形象，在公司里大展身手，反倒令众人对爸爸另眼相看……最后父女俩能变回去吗？他们的关系又将变成怎样？

Kazuhiko Kogure, who is a 2nd grade student in middle school, falls off from one of the school's rooftop. There were other male students on the roof when Kazuhiko Kogure fell off. According to the other students there, Kazuhiko Kogure tried to jump to another school building, but missed. Fortunately, Kazuhiko Kogure only fractured his leg and ribs. According to Kazuhiko Kogure's mother Hidemi, the school insists it was students playing around and did not involve bullying. Hidemi though, doesn't believe it, because Kazuhiko Kogure has a fear of heights. Hidemi goes to see attorney Machiko Mayuzumi and Machiko decides to take her case, but she asks for fellow attorney Kensuke Komikado's help. Meanwhile, the school hires attorney Teshigahara Isao.