The Fandom Post is reporting that YouTube Movies added the K: Missing Kings anime film on August 31, 2021. The film is available in its English language dub only with captions available.
In K: Missing Kings, Silver Clan members Kuro and Neko are on a mission to find their king, Shiro, who went missing after the battle on the School Island involving four of the seven colored kings. During their search, the two discover that Red Clan member Anna Kushina has become the target of the mysterious Green Clan, which intends to use the girl’s special power to track down Shiro. Now the Silver Clan and Red Clans find themselves joining forces to protect Shiro and Anna from this new threat. But will this unexpected alliance be enough to counter the Green Clan’s top fighters, as well as its king?
Source: The Fandom Post