大学四年生菊男与家人的关系非常恶劣，中学时曾经高买而被捕的他，更被辽介视为家庭的耻辱。一直希望可以有一个融洽家庭的菊男，某天遇上一对经营鞋店的津田夫妇，津田夫妇和菊男非常投缘，自此，菊男閒时便会跑到鞋店帮忙，并把津田夫妇视为另一对父母。菊男的祖父健吉与一名比他年轻30岁的女子过着半同居的生活，而父亲辽介则把他亡友的儿子看成是自己的亲生儿子。祖孙三代各自有着一个秘密「家庭」，并享受着当中的「家庭温暖」。某日，当他们的秘密再无法隐藏时，他们的「家庭」也开始崩溃…

Story about the relationship between 3 generations of one family. A son and a young woman, father and his dead friend's wife, grandfather and his new love interest who looks like his granddaughter. It may seem that all of them already found their real happiness outside of their family. But, is it the true happiness?