The film was released in Japan on January 29, 2021.
Marketing The film was announced on June 16, 2020, as the film adaption of the award-winning novel of the same title. It was the first time that
Takanori Iwata and
Arata Mackenyu starred in the same film. On August 25,
Anna Yamada was announced to be the
heroine, playing Kida and Makoto's childhood friend Yocchi. On September 7, 2021,
Anne Nakamura was announced to have joined the cast as Lisa, the spoiled daughter of a politician. The first trailer of the film was released on September 17, 2020, with a new poster. On October 22, with the release of more stills and the official poster, it was announced that the theme song of the film would be "Loose" by
Keina Suda, who wrote the song based on his impression of the film after seeing it. The song was first released on November 17 in a new trailer for the film. On December 18, a spin-off drama,
Re:Na mo Naki Sekai no End Roll~Half a Year Later~ was announced, with its first wave of stills ready for the audiences. A video of the opening scenes of a fatal Christmas Eve in the film was released on December 24, 2020, to celebrate
Christmas Eve. A greeting event celebrating the completion of the film was held on January 7, 2021, in Tokyo, with director
Yuichi Sato and
Takanori Iwata,
Mackenyu Arata,
Anna Yamada, and
Anne Nakamura attending. Another 3 minute cut of the film showing Takanori Iwata(as Kida) holding a gun was released on January 14, 2021. A special event praying for the sales of the film was held at
Kanda Shrine on January 20, 2021. Director
Yuichi Sato attended the event with the main cast. A screening event was held on the same day, before a special movie of the making of the film was released on the next day, showing
Takanori Iwata and
Arata Mackenyu in school uniforms. On January 29, director
Yuichi Sato and
Takanori Iwata,
Mackenyu Arata,
Anna Yamada, and
Anne Nakamura attended the greeting event that celebrated the release of the film in Tokyo, with the event live streamed to 314 cinema around Japan. == Spin-off ==