In the film, a giant monster attacks Japan, but it suddenly dies and it is only a matter of time that a gas explosion will take place from the remains of the monster, which could lead to the collapse of the country. Arata is assigned to lead a special task form team in this critical area and her ex-fiancee, Yukino appears in front of him and she is also the secretary to the environment minister.
Written and directed by Satoshi Miki (Adrift in Tokyo), the film is set for a February 4, 2022 release.
[additional info from AsianWiki]