The second instalment of the Boukyaku Tantei Series.
 
A young man, Oyagiri Mamoru, works as a security guard at a museum.
 
Whenever he visits the area he guards, there's always a beautiful white-haired woman who stops in front of a particular painting. She is Okitegami Kyouko, also known as the Forgetful Detective. They were only supposed to be a guard and spectator until a number of tough cases involving art occurred—.
 
(Source: Kodansha, translated)

The first instalment of the Boukyaku Tantei Series.
 
Okitegami Kyouko, also known as the forgetful detective. She forgets everything in a day, and solves cases (almost) immediately!
An unfortunate young man, Kakushidate Yakusuke, gets caught up in every case and is always the prime suspect! He cries out, "Please let me call a detective—!!!"
 
A swift development, a fleeting memory.
 
Will Kyouko-san be able to solve the case before she forgets its details?
 
(Source: Kodansha, translated)

The third instalment of the Boukyaku Tantei Series.
 
Kujirai, a man not aiming to commit a perfect crime. The beautiful woman he chooses as his "alibi testimony" is a white-haired detective who, worst of all, can only remember one whole day...... In the latest short story, "Okitegami Kyouko's Alibi Testimony," where the forgetful detective becomes a witness in a murder case. The newest story in the Forgetful Detective series brilliantly written by NISIOISIN!
 
(Source: Kodansha, translated)

Twenty-five-year-old Kakushidate Yakusuke suffers from the fate of constantly stumbling into various crime scenes and ending up being the main suspect. 

His last resort: Okitegami Kyouko the "Quickest Detective." However, Kyouko suffers from a strange case of amnesia; whenever she falls asleep, she forgets everything that happened the previous day, making her solve the mysteries within one day.
 
Note: Includes 4 extra chapters.

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