<P> Detective Conan: Crimson Love Letter (名 探偵 コナン から 紅 (くれ ない) の 恋歌 (ラブレター), Meitantei Konan: Kara Kurenai no Rabu Retta) is a 2017 Japanese animated film directed by Kobun Shizuno and written by Takahiro Okura . It is the twenty - first installment of the Case Closed film series based on the manga series of the same name by Gosho Aoyama, following the 2016 film Detective Conan: The Darkest Nightmare . The film was released in Japan on April 15, 2017 . </P> <P> A bombing case at Nichiuri TV in autumn . The Satsuki Cup, which crowns the winner of Japan's Ogura Hyakunin Isshu based competitive karuta tournament, is currently being filmed inside the facility . The incident results in a big commotion and, while the building is burning to ashes, the only people left inside are Heiji and Kazuha . They get rescued just in time by Conan, who rushes to the scene . Both the identity and motive of the bomber are unknown . </P> <P> While confusion takes over due to the explosion, Conan meets a mysterious beautiful girl who claims she is "Heiji's fiancée". Her name is Momiji Ooka and she is the Kyoto High School karuta champion . As fate would have it, Kazuha is going to face Momiji in the Hyakunin Isshu competition, so she begins to train with the help of Heiji's mother, Shizuka, who is a skilled Karuta player . </P> <P> At the same time, in a Japanese house in Arashiyama, Kyoto's outskirts, the reigning Satsuki Cup champion is murdered . Pictures of the crime scene reveal Momji's presence . Additionally, several Karuta cards were spread around the victim . </P>

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