While taking his younger sister to the hospital, Sakuta discovers that there are two Shokos — the one in middle school and the older one who helped him in the past.

Sakuta stops Mai from sacrificing herself and prevents himself from being run over, but now Shoko does not have a heart transplant from anyone and her illness remains uncured.

However, Sakuta refuses to accept such an outcome and together with Mai, they agree to find a way to help the dying young Shoko, knowing that saving her means risking the loss of everything that has happened up to then.

Sakuta and Mai visit a shrine and pass by a beach, where for the first time they encounter Shoko, now a healthy young girl.

The sequel film features a returning staff, including director Sōichi Masui, scriptwriter Masahiro Yokotani, character designer Satomi Tamura, and musical composer Fox Capture Plan.

[8] CloverWorks, which produced the 2018 television series, returns as the production studio, and all voice cast members reprised their roles from the anime.

[11][12] The film has been promoted through merchandise based on characters from the series, including figures of Mai Sakurajima and Shoko Makinohara, which are scheduled for release by Aniplex in 2020.

[18] Kim Morrissy of Anime News Network praised the film, describing it as "a real tearjerker" and that it was a "perfect encapsulation of what makes the Sakuta and Mai relationship so endearing," giving it an overall score of A−, and stated "The film brings all the major themes and characters in its greater story full circle and will probably make you laugh and cry in the process.