Hannin no Hanzawa-san stars the black-silhouetted "criminal" that appears in Detective Conan representing the mystery culprits. Zero no Tea Time focuses on the life of the triple agent, Rei Furuya, also known as Tooru Amuro and Bourbon. Each chapter features one of his three faces, the private detective and Café Poirot waiter Amuro, the Black Organization operative Bourbon, and the NPA officer Furuya.
Kanba began Hannin no Hanzawa-san in Shounen Sunday Super in May 2017. Arai debuted the Zero no Tea Time spin-off in Shounen Sunday in May 2018. Shogakukan will publish the sixth and fifth volume of each on October 18, respectively.