The site also reveals the anime's main staff as below:
The official spin-off comedy series illustrated by Mayuko Kanba has been serialized in Shogakukan's Shonen Sunday S monthly magazine since May 2017, and so far six tankobon volumes have been available in Japan. Its story is set in Beika-cho in Tokyo, a fictional town that is the center of the story in the Detective Conan main series, and follows the daily life of the "Black Man" (Hanzawa-san the Curlpit), a silhouette of an unidentified criminal in Detective Conan.
Teaser PV for "Detective Conan: Zero's Tea Time" and "Detective Conan: The Culprit Hanzawa"
Manga 1st and 6th volume covers:
©Mayuko Kanba, Gosho Aoyama/Shogakukan, "Detective Conan: The Culprit Hanzawa" Production Committe