PRECURE ALL STARS: MINNA DE UTAU♪ KISEKI NO MAHOU!

The film's story will revolve around the power that lies in the tears that the Precures hide. The video reveals that the Precures' tears have the power to end the world, and so the Precures must not cry no matter what. The Precures will fight in the world of song and magic to protect their tears. (Source: Anime News Network) — Description from AniList community (anilist.co).