The special feature discs include the full-length UHD-BD (Dolby Vision(R) & Dolby Atmos(R)) disc and a special edition limited booklet (containing the secret story of the production of the Dolby Cinema version, "Interview with the director and technical staff", etc.). Newly illustrated special case specification. Includes an all-color booklet, two types of Violet's letters (copied version and translated version), a set of Taichi Ishidate's early image board cards, four types of original cover art cards for the "newly written short story booklet" as a gift for theater audiences, and a mini ver. of the theater poster.

This is the first domestic theatrical animation film to be screened in Dolby Cinema(TM) (manufacturer's research) UHD-BD with Dolby Vision(R) and Dolby Atmos(R). This film was screened in seven theaters nationwide from November 13, 2020 in the Dolby Cinema(TM) version, which allows viewers to experience a deep sense of immersion in the film. You can now enjoy the 4K/Dolby Vision high-definition HDR images and Dolby Atmos stereoscopic sound that you experienced at the Dolby Cinema version screenings at home. Dolby Vision can be played on a compatible ULTRA HD Blu-ray player and HDR TV (monitor), while Dolby Atmos can be played on a compatible sound system (amplifier and speaker set). Even in the case of non-compliant devices, it will be adapted to your environment. Dolby, Dolby, Dolby Atmos, Dolby Cinema, Dolby Vision, and the double-D symbol are trademarks or registered trademarks of Dolby Laboratories in the United States and / or other countries.