Black Book

The Black Book are books used by samurai that contain any and all information on Rōnin they are to target.

Purpose
Normally, a Black Book is owned by Captain and members of the Shinsengumi. Each entry on the Black Book is added by a high ranking official, usually the General, who lists a black-listed ninja.

Trivia

 * Black books have played a role during the events of Second World War for various purposes.