The First Slam Dunk

Back in 2003, Toshiyuki Matsui, a producer from Toei Animation, approached Inoue's office to ask if he was willing to make a Slam Dunk movie that would continue the story after where the TV anime left off. It was due to the popular reception of the anime's DVD box; however, the offer was rejected. Six years later, in 2009, Inoue's office approached Matsui to send a proposal regarding the project. Then, Matsui assembled a team led by Naoki Miyahara and Toshio Ohashi that, over a period of nearly 5 years, developed proposal prototype videos of the visual look that can be created using 3DCG, as it appeared to be more realistic to move the large number of characters together in the basketball court than hand-drawn 2D animation. The second prototype, which cost nearly as much as a whole movie, was rejected, as it strayed far off Inoue's vision and did not evoke that the characters were "alive". The third prototype, which had to be the final one, combined 3DCG with 2D animation, and it was the version that laid the infrastructure for Inoue's work as a director.[11]

In December 2014, during a dinner with Matsui, Inoue gave the greenlight to the film. Matsui, then, suggested that Inoue should write the script and direct, as he was the person to be trusted the most with the characters' dialogue and their visual appearance and expression.[11] After Inoue accepted, he began working on the script in January 2015.[11] In 2018, work on the motion capture and models commenced.[11]

On January 6, 2021, Inoue suddenly announced on his Twitter account that the movie was in production.[12] Then, on August 13, 2021, Inoue was revealed to be the screenwriter and director of the film, along with other production staff members such as Yasuyuki Ebara as character designer/animation director and Naoki Miyahara, Katsuhiko Kitada, Toshio Ohashi, Yasuhiro Motoda, Fumihiko Suganuma, and Haruka Kamatani as sequence directors.[13][14][15]

On July 1, 2022, five new character posters were installed in theaters across Japan, where the release date of December 3, 2022 and the title The First Slam Dunk were officially announced. The official website of the film held interviews with multiple production staff members, where they shared their contribution to the film and Inoue's requests for the film.[11] According to character designer/general animation director Yasuyuki Ebara, Inoue wanted the character designs to follow his recent illustrations shown in the new Slam Dunk Refurbished edition volumes released in 2018, instead of the older designs of the manga.[11] The film's art director Kazuo Ogura and color designer Shiori Furusyo stated that Inoue wanted the movie to specifically feel as if the manga itself is in motion; therefore, he generally wanted a light and desaturated color palette. In addition, to make the backgrounds more manga-like, they had to look more hand-drawn and less realistic. Also, they mentioned that the movie was a blend of 3DCG for the basketball scenes and hand-drawn 2D animation for daily life scenes. Therefore, the film tries to bring the best of both worlds.[11] On that note, CG director Daiki Nakazawa stated the same thing, but mentioned that there are some 2D basketball scenes where the animators used the motion capture for reference to portray basketball movements with much realism as possible. The movie, also, used the assistance of professional basketball players to review how the game was depicted.[11]

When asked about his reason for involving himself in the film, Inoue stated that he was encouraged by the enthusiasm of the people who worked on the prototype versions and after seeing a good image of Sakuragi's face, he thought that getting himself involved would make it even better. He, also, stated that his main job as a director was to make sure that blood was injected into the characters and that they were brought to life. He corrected and retouched scenes, both in 3D and 2D, and drew multiple storyboards for the film. As for his aims regarding the story, he mentioned that he aimed for the film to be a new look into Slam Dunk, from a new perspective, where instead of focusing on a protagonist with endless possibilities and great potential, he wanted to focus on the perspective of living with pain and overcoming it. Therefore, he chose the title The First Slam Dunk, as it is a movie that wants the audience familiar with the story to experience it as if it was their first time, and those unfamiliar with it to have it be their first Slam Dunk experience. On the subject of changing the TV anime's voice actors, he stated that if he were to ask them to return, he would have asked them to throw away their perception and understanding of the characters that they professionally cultivated over the years, which is something he could not do. With the new voice actors, he put emphasis on the quality of their natural voices more than their acting skills.[11]

As of August 31, 2023, The First Slam Dunk grossed $258 million worldwide;[5] including over ¥15.53 billion ($106.9 million) grossed in Japan.[29][30] It is the fifth highest-grossing anime film of all time.[31] In Japan, the film debuted at number one at the box office, grossing ¥1.296 billion ($9.5 million) during its first two days.[32] The film remained at the top spot in its second and third weekends, grossing ¥825 million ($6 million) and ¥547 million ($3.99 million).[33][34]

In South Korea, the film sold 3,818,000 tickets and grossed more than $30.38 million by March 2023, surpassing 2016's Your Name to become the highest-grossing anime film of all time in the country.[35] By April 2023, the film has sold over 4.5 million tickets and grossed over $35.5 million in South Korea. It is the second highest-grossing film of 2023 in South Korea, surpassed only by another anime film, Suzume.[36] In China, the film topped the box office with a record $56 million opening weekend, beating the Jackie Chan film Ride On as well as The Super Mario Bros. Movie.[37] The First Slam Dunk set several opening records in China, including the highest pre-sales for an animated import.[38] Its IMAX opening weekend of CN¥38 million is also the highest for a foreign animated film in China.[39] As of April 30, it has made $75.8 million in China.[40]

In North America, The First Slam Dunk earned over $625,000 in its opening weekend at the box office.[41] In Chile, it debuted at the top of the box office, surpassing Barbie and Oppenheimer, blockbusters released two weeks prior.[42]

The First Slam Dunk was awarded the Japan Academy Prize for Animation of the Year at the 46th Japan Academy Film Prize in 2023.[43][44] The film won the Okawa-Fukiya Award at the Niigata International Animation Film Festival 2023.[45] Toshiyuki Matsui, the producer of the film, received the Grand Prize of the 42nd annual Fujimoto Awards for his work on the film.[46] It won the Best Animated Feature Film at the 27th annual Fantasia International Film Festival in 2023.[47]