女大学生圣山环菜在主播面试之后,刺杀了身为知名画家的父亲。因为她的外貌姣好,加上被逮捕后抛下的一句:「你们自己去查出我的杀人动机。」使得媒体不断渲染报导,为何前途光明的女儿会杀害了父亲?为何连她自己都不明白原因? 同时,临床心理师真壁由纪受出版社委托,计划将圣山环菜的故事撰写成书,因而开始研究这起事件。一个狐媚般的女孩、感情关系复杂……当周遭人物对环菜的可疑处指证历历时,由纪却发现,在环菜身上有块缺失的关键记忆。若找到记忆中那段初恋,是否就能解开杀父的原因?A university student has the usual dreams and aspirations. It turns out to be a pipe dream and so she murders her own flesh and blood. The usual media heads seek an answer in order to sell copy. A psychologist is writing a book about the character and incident. Her research for the subject matter turn the psychologist inward and things come out of the shadows that perhaps are better left buried deep in the shadows of the psyche.