Okitegami Kyouko no Suisenbun

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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)