舞台会设定在自横滨大街陷入混乱的那个事件以后的3个月，主人公之一的紫携手失忆少女初，再度以侦探的身份开启了他们的活动。究竟亚特为什么会把枪口对准奈斯？包裹着谜团的真相即将在今年夏天揭晓。

电视动画《文豪野犬》改编自朝雾卡夫卡原作，春河35负责作画的同名漫画。

五年前，大冢村一夜之间瘟疫流行，周围的村庄为了防止疫病蔓延，一把火烧毁了整个大冢村。
大冢村的三个孩子，犬冢信乃、犬川庄介以及滨路得以幸存。
三人被教会收养，并在别的村庄中过着平静的生活。
而在大冢村事件中获得了特殊的能力的信乃和庄介，则一直不明原因地被帝国教会总部寻找。
大冢村事件发生的五年后，终于寻觅到信乃与庄介踪迹的教会总部，为了引诱两人来帝都，竟然带走了滨路……

In times of need, if you look in the right place, you just may see a strange telephone number scrawled in red. If you call this number, you will hear a young man introduce himself as the Yato God. Yato is a minor deity and a self-proclaimed "Delivery God," who dreams of having millions of worshippers. Without a single shrine dedicated to his name, however, his goals are far from being realized. He spends his days doing odd jobs for five yen apiece, until his weapon partner becomes fed up with her useless master and deserts him.