高中生春海和人（樱井孝宏 饰）是一个不可救药的阅读痴，为了能尽早读到新出版的图书，他努力考上东京的名门学校，并独自一人在此生活，终日与书籍为伴。在他的收藏中，春海尤其偏爱神秘作家秋山忍风格多变的著作。某天，春海所在咖啡店突遭歹徒，为保护身后一名只顾奋笔疾书的少女，他被歹徒残忍杀害。正前往另一个世界的春海，无论如何希望读完秋山忍“大罪系列”最后一部小说。凭借这股执念他重返人间，谁知却俯身在一条长毛腊肠狗身上。未过多久，狗狗春海邂逅能够听懂他心声的古怪少女夏夜雾姬（井上麻里奈 配音），而对方另一个身份正是秋山忍。阅读痴撞上写作痴，有趣的故事拉开序幕…… 本片根据更伊俊介（原著）、鍋島テツヒロ（插画）的同名原作改编
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