故事跨越时空，从维京时代到幕府日本至二战时期，讲述三个铁血战士的勇猛事迹。人类的宿命是否将从此改写？
“我想起来了……”沉睡的记忆与真相即将觉醒。 故事以长野县为舞台，高人气角色“长野三人组”大和敢助、诸伏高明、上原由衣将登场亮相。当毛利小五郎警视厅时期同事“鳄鱼”遭遇意外，与致使大和敢助“独眼”的神秘雪崩案交织，无法兑现的承诺和独眼中的残像就此重叠。雪花飞舞，真相与爱意终将明晰！这一次，毛利小五郎将不再沉睡，与柯南、大和敢助等人携手探案，亲手揭开掩埋于雪山之下的秘密与真相……
Adolfo (55), a famous short story writer, decides to write his first novel and gives his daughter Dalia (6) the gift of creating a character for the story. She chooses a goat, like her stuffed animal. After the death of her father, Dalia (12) is kidnapped by the characters of the story. Through a portal, they make her a character of the novel “The Red Book”. While struggling to find a way out with the help of Goat, Dalia must face the other characters, who will do anything to become the main characters of the book. She is the only one capable of writing the final chapter, though she doesn’t feel confident enough. Dalia has only 12 hours, a blank page, and a pen to complete the story. The adventure within the book leads her to discover who her father’s friends and enemies were. She writes the ending and discovers whether she wants to follow in her father's footsteps as a writer or not.
很久很久以前，膝下无子的穷樵夫与妻子过着寒苦日子。某日大雪，集装箱列车如常划破森林的宁静，却在铁轨旁遗留了一名婴孩。樵夫坚信那定是火车载运的万恶异族所抛下的孽种，妻子则认为是上天恩赐，执意留下孩子，而这个选择，彻底改变了他们的命运。在世界最黑暗的时刻，良善的灵魂依然催生了希望之光。
