以小池真理子的小说为基础,讲述读大学哲学科的平凡学生阿珠,被研究生论文导师提议做记录某个专一对象生活和行为的“哲学跟踪”,于是开始跟踪邻居一家的丈夫的故事。As an adaptation of a Koike Mariko novel, which was inspired by the artwork True Stories by artist Sophie Calle, the film follows philosophy graduate Tamaki who, in turn, follows a man in her neighbourhood in the name of 'philosophical surveillance.' The man, it turns out, is having an affair.