The tenth instalment of the Boukyaku Tantei Series.
 
The only employee of the Okitegami Detective Agency, Oyagiri Mamoru, receives a sudden threatening phone call. "If you want Okitegami Kyouko back, you'll have to come up with one billion yen." He is the only one who can rescue the lonely forgetful detective. Although he doesn't have the powers of deduction like Kyouko-san does, he does have a "memory" of her. Mamoru begins his investigation with his own hands. Meanwhile, Kyouko-san wakes up in the presence of the murderer—? The pure white Okitegami Detective Agency vs. the jet-black kidnapper! How will this head-to-head battle end?!
 
(Source: Kodansha, translated)

The ninth instalment of the Boukyaku Tantei Series.
 
The forgetful detective, Okitegami Kyouko, is arrested as a suspect in a robbery-murder case. She was found asleep at the scene, clutching the bloody murder weapon, and had forgotten her memories of the incident. When Kyouko-san offers to investigate the case from inside her cage, she is confronted by Hitaisei, a strong police officer nicknamed "the False Accuser". As he struggles with his pride as a police officer, he chooses to ask for the help of the "forgetful detective expert", Kakushidate Yakusuke...?
 
(Source: Kodansha, translated)

The eleventh instalment of the Boukyaku Tantei Series.
 
Okitegami Kyouko—her memory resets every time she sleeps. Taking advantage of this characteristic, she works as the "forgetful detective". In the name of business, she sets out on a trip with her bodyguard, Oyagiri Mamoru. She has no particular destination in mind. What kind of incident awaits them on this trip?
 
(Source: Kodansha, translated)

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