This year's 17th issue of Shogakukan's Weekly Shonen Sunday magazine is revealing on Wednesday that Daisuke Ono is joining the cast of Meitantei Conan Kara Kurenai no Love Letter (Detective Conan: Crimson Love Letter), the 21st Detective Conan (Case Closed) anime film. He plays the character Muga Iori in the film. Muga is a butler to Momiji's family. The character has already appeared in the manga, and the film will be his first anime appearance.

The film's official website previously streamed the film's first full trailer last month.

The film will open in Japanese theaters on April 15. The film will be a love story set in Osaka, and it will feature Heiji Hattori and Kazuha Toyama. The visual (pictured at right) shows Momiji Ōoka, a high school karuta champion who refers to Heiji as her future husband and is a romantic rival for Kazuha. She appears in the manga for the first time in the 91st compiled volume, which shipped on December 16 in Japan, and this will be her first anime appearance. Satsuki Yukino voices the character.