|Origin of the Detective Agency: Untold Story|
|Published on|| May 1, 2015 (JP)|
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The novel also tells a little bit of Sakunosuke Oda's past as an assassin.
- The Daily Routine of a Detective Agency
- Origin of the Detective Agency: Untold Story
- Sakunosuke Oda later quit his assassin job after meeting Natsume Souseki.
- Sometime after the agency's establishment, Kunikida and Yosano joins in.
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