Ep. 712: Hattori Heiji and the Vampire Mansion (Part 1)

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Following the murder in Tokyo, Heiji and Kazuha accompany Otaki with Conan and company to investigate a "vampire" curse on a family as a request from Hattori's father to Otaki. At the arrival of the mansion, it is reavealed that the butler submitted the request to Heiji's father. He requested a detective to be present at the inheritance ceremony (Source: Wikipedia)