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.

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)

The fourth instalment of the Boukyaku Tantei Series.
 
Kakushidate Yakusuke is a young man with a history of false accusations. All kinds of misfortune befall him, and now a girl has fallen on top of him! A time-constrained mystery about a forgetful detective who loses her memory every time she sleeps!
 
A junior high school student attempts suicide by jumping off a building. A twenty-five-year-old young man named Kakushidate Yakusuke is present at the scene, but due to his innate tendency to be falsely accused by others, he is made a suspect. A suicide note, allegedly written by the girl, is left at the scene. Will Kyouko-san be able to clear the suspicions and solve the case?
 
(Source: Kodansha, translated)

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 eighth instalment of the Boukyaku Tantei Series.
 
"I'll snatch the Eiffel Tower." --Miss Phantom Thief.
 
The forgetful detective, Okitegami Kyouko, is invited to Paris to stop a daring crime threat. However, the thief's true plan is to have Kyouko-san herself steal the Eiffel Tower......?! Stolen memories and a brilliant trap. Can her assistant, Kakushidate Yakusuke, save Kyouko-san from the thief's clutches?
 
(Source: Kodansha, translated)

The fifth instalment of the Boukyaku Tantei Series.
 
With her resignation letter tucked into her breast pocket, Inspector Hatopa was shaken. Her last case is a drowned body found floating in a park fountain. However, due to its inexplicability, she is forced to investigate in cooperation with the famous forgetful detective, Okitegami Kyouko...... A detective wishing to quit and a workaholic detective. A strange tag team takes on the mystery!
 
(Source: Kodansha, translated)

The sixth instalment of the Boukyaku Tantei Series.
 
The forgetful detective Okitegami Kyouko gives her "first" lecture. A dangerous love question is posed towards Kyouko-san while she's on stage leads to a false accusation, and a young man named Kakushidate Yakusuke receives an unexpected proposal...... Will the beautiful forgetful detective be able to stop the cursed marriage?
 
(Source: Kodansha, translated)

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