Okitegami Kyouko no Taishokunegai(2015)

Okitegami Kyouko no Taishokunegai

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)