"The first 2017 issue of Shogakukan's Weekly Shonen Sunday announced on Wednesday that the 21st Detective Conan anime film is titled Meitantei Conan Kara Kurenai no Love Letter (Detective Conan: Crimson Love Letter) and is slated to open in Japanese theaters on April 15, 2017. The magazine also unveiled the staff, cast, and a teaser poster illustrated by original creator Gosho Aoyama.
"Kobun Shizuno, the director of the last six Detective Conan films, will return to direct the film at TMS and V1 Studio. Takeharu Sakurai is also returning from earlier films to write the script based on Aoyama's story, and franchise composer Katsuo Ono is again providing the music.
"The film will be a love story set in Osaka, and it will feature Heiji Hattori and Kazuha Toyama. The visual shows Momiji Ōoka, a new character who refers to Heiji as her future husband and is a rival for Kazuha. She appears in the manga for the first time in the 91st compiled volume, which will ship on December 16 in Japan."
Sources: Anime News Network, DCTP